Exhibit 10.7

EXECUTION COPY

SUPPLEMENT NO. 1, dated as of December 11, 2012 (this “Supplement”), to the Guaranty, dated as of May 8, 2012 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Guaranty”), among TRAVELPORT LIMITED, a company incorporated under the laws of Bermuda (“Holdings”), WALTONVILLE LIMITED, a company incorporated under the laws of Gibraltar (“Intermediate Parent”), TDS INVESTOR (LUXEMBOURG) S.À R.L., a société à responsabilité limitée incorporated under the laws of Luxembourg (“TDS Intermediate Parent”), the other Subsidiaries of Holdings from time to time party thereto and CREDIT SUISSE AG, as Administrative Agent.

A. Reference is made to the Credit Agreement, dated as of May 8, 2012 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among Travelport LLC, a Delaware limited liability company (the “Borrower”), Holdings, Intermediate Parent, TDS Intermediate Parent, Credit Suisse AG, as Administrative Agent and Collateral Agent, and each Lender from time to time party thereto.

B. Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to such terms in the Guaranty.

C. The Guarantors have entered into the Guaranty in order to induce the Lenders to make Loans. Section 4.14 of the Guaranty provides that additional Restricted Subsidiaries may become Subsidiary Parties under the Guaranty by execution and delivery of an instrument in the form of this Supplement. Each of the undersigned Restricted Subsidiaries (each, a “New Subsidiary”) is executing this Supplement in accordance with the requirements of the Credit Agreement to become a Subsidiary Party under the Guaranty and as consideration for Loans previously made continuing to be outstanding.

Accordingly, the Administrative Agent and each New Subsidiary agree as follows:

SECTION 1. In accordance with Section 4.14 of the Guaranty, each New Subsidiary by its signature below becomes a Subsidiary Party (and accordingly, becomes a Guarantor under the Guaranty with the same force and effect as if originally named therein as a Subsidiary Party), and each New Subsidiary hereby (a) agrees to all the terms and provisions of the Guaranty applicable to it as a Subsidiary Party and Guarantor thereunder and (b) represents and warrants that the representations and warranties made by it as a Guarantor thereunder are true and correct on and as of the date hereof. Each reference to a “Guarantor” in the Security Agreement shall be deemed to include each New Subsidiary. The Guaranty is hereby incorporated herein by reference.

SECTION 2. Each New Subsidiary represents and warrants to the Administrative Agent and the other Secured Parties that this Supplement has been duly authorized, executed and delivered by it and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, except as such enforceability may be limited by Debtor Relief Laws, fraudulent transfer, preference or similar laws and by general principles of equity.

SECTION 3. This Supplement may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Supplement shall become effective when the Administrative Agent shall have received counterparts of this Supplement that, when taken together, bear the signature of each New Subsidiary and the Administrative Agent has executed a counterpart hereof. Delivery of an executed signature page to this Supplement by facsimile transmission or other electronic image transmission (e.g. “PDF” or “TIF” via electronic mail) shall be as effective as delivery of a manually signed counterpart of this Supplement.

SECTION 4. Except as expressly supplemented hereby, the Guaranty shall remain in full force and effect.

SECTION 5. THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

SECTION 6. In case any one or more of the provisions contained in this Supplement should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and in the Guaranty shall not in any way be affected or impaired thereby (it being understood that the invalidity of a particular provision in a particular jurisdiction shall not in and of itself affect the validity of such provision in any other jurisdiction). The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.

SECTION 7. All communications and notices hereunder shall be in writing and given as provided in Section 4.01 of the Guaranty.

SECTION 8. Each New Subsidiary agrees to reimburse the Administrative Agent for its reasonable out-of-pocket expenses in connection with this Supplement, including the reasonable fees, other charges and disbursements of counsel for the Administrative Agent.

SECTION 9. Notwithstanding anything herein to the contrary, the exercise of any right or remedy by the Administrative Agent hereunder is subject to the provisions of the Intercreditor Agreement. In the event of any conflict between the terms of the Intercreditor Agreement and this Agreement, the terms of the Intercreditor Agreement shall govern and control.

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IN WITNESS WHEREOF, each New Subsidiary and the Administrative Agent have duly executed this Supplement to the Guaranty as of the day and year first above written.