Exhibit 99.1

Macquarie Infrastructure Company LLC Reports First Quarter 2010 Financial Results, 75% Increase in Proportionately Combined Free Cash Flow

• Results for International-Matex Tank Terminals reflects continued strong demand for tankage, 10% increase in average storage rates
• Free cash flow at Atlantic Aviation more than doubles on continued recovery in general aviation jet flight activity, reduced expenses
• Net loss from continuing operations narrows 88% to $5.5 million for the quarter

NEW YORK--(BUSINESS WIRE)--May 5, 2010--Macquarie Infrastructure Company LLC (NYSE: MIC) reported financial results for the first quarter of 2010 including a 75% increase in proportionately combined free cash flow. MIC regards free cash flow as an important tool in assessing the performance of its capital intensive, cash generative businesses. MIC defines free cash flow as cash from operating activities, less maintenance capital expenditures and changes in working capital. Proportionately combined free cash flow increased to $36.7 million, or $0.81 per share, from $21.0 million, or $0.47 per share in 2009.

“The performance of our energy-related businesses continues to illustrate the key characteristics of infrastructure – stability and growth in cash generation,” said James Hooke, chief executive officer of Macquarie Infrastructure Company. “The result produced by IMTT during the quarter, in particular, was outstanding.”

“We are very pleased with the continued recovery in general aviation jet activity,” Hooke added. “The result for Atlantic Aviation also reflects the benefits derived from the successful implementation of cost reduction initiatives over the past two years.”

MIC reported a net loss from continuing operations of $5.5 million for the first quarter in 2010 compared with a net loss of $46.4 million in the first quarter of 2009. Infrastructure businesses employ high-value tangible and intangible assets which generate non-cash expenses that reduce GAAP net income. The 2009 net loss included a write-down of goodwill and other intangibles totaling $43.7 million at Atlantic Aviation that did not recur in 2010, as well as larger non-cash losses on derivatives than were generated in 2010.

MIC’s consolidated revenue for the first quarter of 2010 increased 20% compared with 2009 to $201.3 million. The majority of the increase was attributable to fuel sales at Atlantic Aviation and the impact of price increases at The Gas Company. Energy costs, including the cost of jet fuel sold by Atlantic Aviation and feedstock used by The Gas Company, are passed through to customers of MIC’s businesses and recovered in revenue. An analysis of gross profit, or revenue less cost of goods sold, rather than revenue alone removes the volatility associated with fluctuations in energy costs.

The following table, reflecting results of continuing operations for MIC’s businesses for the quarters ended March 31, 2010 and 2009, has been conformed to current period’s presentation reflecting gross profit, EBITDA excluding non-cash items and free cash flow. See the attached tables for a reconciliation of net income attributable to MIC LLC to EBITDA excluding non-cash items and cash from operating activities to free cash flow.

Proportionately combined free cash flow includes the cash generated at MIC’s wholly-owned subsidiaries as well as its 50% interest in the free cash flow generated by IMTT and 50.01% interest in the free cash flow generated by District Energy, all offset by MIC corporate level expenses. Proportionately combined free cash flow does not fully reflect MIC’s ability to freely deploy generated cash, as it does not reflect required principal payments on indebtedness and other fixed obligations, among other items. Free cash flow, as defined by MIC, should be used as a supplemental measure and not in lieu of financial results reported under GAAP.

IMTT

MIC has a 50% equity interest in International-Matex Tank Terminals (“IMTT”), the operator of one of the largest independent bulk liquid storage terminal businesses in the U.S. IMTT owns and operates 10 marine storage terminals in the U.S. and has interests in two terminals in Canada. The terminals store and handle a wide variety of petroleum grades, chemicals and vegetable and animal oils.

Strong demand for tankage, particularly in IMTT’s key New York Harbor and lower Mississippi River markets, helped drive terminal gross profit up by 17% and generate an increase in average storage rental rates of more than 10% year over year. The rental of 16 tanks constructed during the past year at the St. Rose facility on the lower Mississippi River also contributed to the increase.

Environmental response gross profit for the quarter increased to $3.3 million, from a loss of $807,000 in the prior comparable period. IMTT’s Oil Mop subsidiary was involved in an oil spill clean-up effort along the Texas coast in January and February of 2010.

Maintenance and environmental capital expenditures at IMTT totaled $7.8 million during the quarter. The business expects that full-year maintenance and environmental capital expenditures will be approximately $55.0 million.

IMTT is evaluating growth capital projects having an aggregate capital cost in excess of $150.0 million. Free cash flow generated by IMTT, other than $5.0 million distributed to each of its two shareholders, including MIC, in the first quarter of 2010, is being retained to fund growth capital expenditures. IMTT will proceed with these projects if development can be undertaken on economically favorable terms.

Free cash flow generated by IMTT in the first quarter of 2010 increased 53% to $33.5 million from $21.9 million in the first quarter of 2009.

The Gas Company

The Gas Company is the owner and operator of the only regulated (“utility”) gas manufacturing and pipeline distribution network on the islands of Hawaii. The business is also the owner and operator of the largest unregulated (“non-utility”) gas distribution operation on the islands.

Utility contribution margin increased compared with 2009 despite a 4% decline in the volume of gas products sold. Utility contribution margin increased as a result of the interim rate case granted by the Hawaii Public Utility Commission (“HPUC”) in June 2009. Demand declined primarily among commercial customers, given their heightened sensitivity to the slowdown in economic activity compared with residential customers.

In April 2010, the HPUC issued a Final Order on the rate case in which it reduced the previously granted rate increase of $9.5 million by approximately $300,000. The Gas Company will be required to refund customers the approximately $216,000 in “excess” payments collected during the period between the granting of the interim and final orders and booked an adjustment to utility revenue in that amount in the first quarter.

In addition, The Gas Company made corrections to the calculation of the pass through of changes in feedstock costs (Fuel Adjustment Charges) booked during the period between the granting of the interim and final orders. The corrections resulted in an adjustment that increased utility cost of revenue by $623,000 in the first quarter of 2010.

Non-utility contribution margin was flat year over year reflecting a slight uptick in the volume of propane sold, and an offsetting overall increase in the cost of propane. The increase in the cost of propane was a result of The Gas Company importing a larger percentage of gas from foreign sources in 2010 rather than obtaining it from local refiners as it did in 2009. However, the cost of foreign sourced product includes the cost of transporting the gas to and within the Hawaiian Islands. Local refiners supplied The Gas Company with approximately 25% less propane in the first quarter of 2010 than they did in the first quarter of 2009.

The Gas Company generated $6.6 million of free cash flow in the first quarter of 2010. Free cash flow decreased by $521,000 compared with 2009 primarily as a result of increased income taxes.

District Energy

MIC’s District Energy business produces chilled water that it distributes via underground pipelines in downtown Chicago to high-rise buildings for use in air conditioning and process cooling systems. The business also operates a site-specific operation that supplies both cooling and heating services to three customers in Las Vegas, Nevada. MIC sold a 49.99% (non-controlling) interest in the business in December 2009.

The connection of new customers to the Chicago system in 2009 resulted in an increase in capacity revenue in 2010 compared with 2009. Consumption revenue declined primarily due to a decrease in the recovery of electricity costs resulting from a reduction in the cost of energy inputs. Consumption revenue also decreased as District Energy worked with certain customers to optimize their cooling systems which reduced their ton hours of cooling used.

District Energy generated free cash flow of $2.0 million in the first quarter of 2010. This amount was approximately $154,000, or 8%, more than was generated in the first quarter of 2009.

Atlantic Aviation

Atlantic Aviation owns and operates a network of fixed-base operations (FBO) that primarily provide fuel, terminal services, and aircraft hangar services to owners and operators of private (general aviation) jet aircraft at 68 airports and one heliport in the U.S. The network is the largest of its type in the U.S. air transportation industry.

An overall increase in the level of general aviation jet flight activity resulted in an increase in the volume of fuel sold by Atlantic Aviation. The volume of fuel sold increased 5.2% and was partially offset by a 3.2% decrease in weighted average fuel margin. The decrease in fuel margin was driven by changes in the relative volumes of different customer segments and locations, as well as competition.

Excluding the impact of military-related fuel volume (at two locations) which tends to be volatile and did not re-occur in 2010, fuel volume would have increased by 9% and the weighted average fuel margin would have declined by 5%. The increase in volume was in line with the approximately 11% increase in flight activity levels at the airports on which Atlantic operates. The increase in the volume of fuel sold was also offset by a decrease in gross profit from other services including hangar and service fees. Together, these factors resulted in aggregate gross profit for the first quarter being flat with the first quarter in 2009.

Selling, general and administrative (SG&A) expenses decreased at Atlantic Aviation as a result of ongoing expense reduction initiatives and the absence of a $2.4 million bad debt reserve that was booked in 2009. A year on year reduction in interest expense, resulting from lower debt balances in 2010 compared with 2009, and the lower SG&A expenses offset the flat gross profit and contributed to a more than doubling of free cash flow. Atlantic Aviation generated $13.4 million and $5.5 million of free cash flow in the first quarters of 2010 and 2009, respectively.

Under the terms of its debt agreement, Atlantic Aviation is applying all of its excess cash flow to pre-pay debt principal. The business applied $27.2 million of excess cash flow to pre-pay $24.7 million of term loan principal and incurred $2.5 million of related interest rate swap breakage fees during the first quarter. Assuming no additional performance improvements, the business would expect to pre-pay an additional approximately $28.0 million of debt in 2010.

On May 3, 2010 Atlantic Aviation utilized $3.3 million of excess cash flow to pre-pay $3.0 million of term loan principal and incurred $296,000 of swap breakage fees. Using the EBITDA generated during the twelve months ended March 31, 2010, as adjusted per the terms of the loan agreement, Atlantic Aviation’s debt to EBITDA ratio decreased to approximately 7.4x.

Effective April 4, 2010, Atlantic Aviation sold its lease and ceased operations at the general aviation airport in Kissimmee, Florida with no residual obligations. The Kissimmee FBO did not make a positive contribution to the EBITDA of Atlantic Aviation in 2009.

On April 28, 2010, Atlantic Aviation entered into a 30-year lease agreement, including a five year extension, and an agreement to construct a new fixed base operation, at Will Rogers World Airport in Oklahoma City, Oklahoma. Atlantic Aviation has received a commitment letter from an unrelated third party lender to provide approximately $3.6 million of term loan funding against a total anticipated project cost of $6.6 million. MIC will provide the remaining $3.0 million of equity funding. The FBO is expected to be operational in February 2011 and to generate an incremental $1.6 million of EBITDA (average over five years) annually.

Use of Non-GAAP Measures

MIC has reported EBITDA excluding non-cash items on a consolidated and operating segment basis and reconciled each to the corresponding financial statements. EBITDA excluding non-cash items is a metric relied upon by management in evaluating the performance of its businesses and investment. EBITDA excluding non-cash items is defined as earnings before interest, taxes, depreciation and amortization and non-cash items, which include impairments, derivative gains and losses and adjustments for other non-cash items reflected in the statement of operations. MIC believes that EBITDA excluding non-cash items provides additional insight into the performance of its operating businesses, relative to each other and to similar businesses, without regard to capital structure, and their ability to service or reduce debt, fund capital expenditures and/or support distributions to the holding company.

MIC also reports free cash flow, as defined below, as a means of assessing the amount of cash generated by its businesses and as a supplement to other information provided in accordance with GAAP. MIC believes that reporting free cash flow will provide investors with additional insight into its ability to deploy cash in the future, as GAAP metrics such as net income and cash from operating activities do not reflect all of the items that management considers in estimating the amount of cash generated by its operating entities.

MIC defines free cash flow as cash from operating activities, less maintenance capital expenditures and changes in working capital. Working capital movements are excluded on the basis that these are largely timing differences in payables and receivables, and are therefore not reflective of MIC’s ability to generate cash.

MIC notes that free cash flow does not fully reflect its ability to freely deploy generated cash, as it does not reflect required principal payments on indebtedness, payments of dividends and other fixed obligations, among other items excluded when calculating free cash flow. Free cash flow may be calculated in a different manner by other companies, which limits its usefulness as a comparative measure. Free cash flow, as defined by MIC, should be used as a supplemental measure and not in lieu of financial results reported under GAAP.

Conference Call and WEBCAST

When: Management has scheduled a conference call for 8:00 a.m. Eastern Time on Thursday, May 6, 2010 to review the Company’s first quarter 2010 results.

How: To listen to the conference call please dial +1(650) 521-5252 at least 10 minutes prior to the scheduled start time. Interested parties can also listen to a webcast of the call. The webcast will be accessible via the Company’s website at www.macquarie.com/mic.

Materials: The Company will prepare printable materials in support of its conference call presentation. The materials will be available for downloading from the Company’s website the morning of May 6, 2010 prior to the conference call. A link to the materials will be located on the homepage of the MIC website.

Replay: For interested individuals unable to participate in the conference call, a replay will be available after 2:00 p.m. on May 6 through May 20 at +1(706) 645-9291, Passcode: 72055265. An online archive of the webcast will be available on the Company’s website for one year following the call.

MIC filed its financial report for the first quarter of 2010 on SEC Form 10-Q after the close of the financial markets on May 5, 2010.

About Macquarie Infrastructure Company

Macquarie Infrastructure Company owns, operates and invests in a diversified group of infrastructure businesses providing basic services to customers in the United States. Its businesses consist of three energy-related businesses including a gas production and distribution business in Hawaii, The Gas Company, and a controlling interest in a District Energy business in Chicago, and a 50% indirect interest in a bulk liquid storage terminal business, International-Matex Tank Terminals. MIC also owns and operates an airport services business, Atlantic Aviation. The Company is managed by a wholly-owned subsidiary of the Macquarie Group. For additional information, please visit the Macquarie Infrastructure Company website at www.macquarie.com/mic. MIC-G

Forward-Looking Statements

This filing contains forward-looking statements. MIC may, in some cases, use words such as "project”, "believe”, "anticipate”, "plan”, "expect”, "estimate”, "intend”, "should”, "would”, "could”, "potentially”, or "may” or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. Forward-looking statements in this report are subject to a number of risks and uncertainties, some of which are beyond MIC’s control including, among other things: changes in general economic or business conditions; its ability to service, comply with the terms of and refinance debt, successfully integrate and manage acquired businesses, retain or replace qualified employees, manage growth, make and finance future acquisitions, and implement its strategy; its shared decision-making with co-investors over investments including the distribution of dividends; its regulatory environment establishing rate structures and monitoring quality of service, demographic trends, the political environment, the economy, tourism, construction and transportation costs, air travel, environmental costs and risks, fuel and gas costs; its ability to recover increases in costs from customers, reliance on sole or limited source suppliers, risks or conflicts of interests involving its relationship with the Macquarie Group and changes in U.S. federal tax law.

MIC’s actual results, performance, prospects or opportunities could differ materially from those expressed in or implied by the forward-looking statements. Additional risks of which MIC is not currently aware could also cause its actual results to differ. In light of these risks, uncertainties and assumptions, you should not place undue reliance on any forward-looking statements. The forward-looking events discussed in this release may not occur. These forward-looking statements are made as of the date of this release. MIC undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

“Macquarie Group” refers to the Macquarie Group of companies, which comprises Macquarie Group Limited and its worldwide subsidiaries and affiliates. Macquarie Infrastructure Company LLC is not an authorized deposit-taking institution for the purposes of the Banking Act 1959 (Commonwealth of Australia) and its obligations do not represent deposits or other liabilities of Macquarie Bank Limited ABN 46 008 583 542 (MBL). MBL does not guarantee or otherwise provide assurance in respect of the obligations of Macquarie Infrastructure Company LLC.

CONTACT:
Macquarie Infrastructure Company LLC
Investor Relations
Jay A. Davis, 212-231-1825
jay.davis@macquarie.com
or
Paula Chirhart, 212-231-1310
Media Relations
paula.chirhart@macquarie.com