SUPPLEMENTAL AGREEMENT NO. 13 to PURCHASE AGREEMENT NUMBER 2022 between THE BOEING COMPANY and Delta Air Lines, inc. Relating to Boeing Model 737NG Aircraft

The information contained herein represents confidential business information and has value precisely because it is not available generally or to other parties.  Each party will limit the disclosure of its contents to its employees with a need to know the contents for purposes of helping it perform its obligations under the Purchase Agreement and who understand they are not to disclose its contents to any other person or entity without the prior written consent of the other party.  Notwithstanding the foregoing, either party may disclose this Letter Agreement (i) for the purpose of regulatory requirements, including without limitation registrations and filings pursuant thereto, or as otherwise required by law, provided that the disclosing party makes commercially reasonable efforts to notify the non-disclosing party in advance of such disclosure and considers in good faith all limitations on such disclosure requested by the non-disclosing party; (ii) for the purpose of disclosure to its auditors and its legal advisors on a need to know basis who themselves agree not to further disclose such information; and (iii) to the extent such information is publicly available other than as a result of the disclosure by or on behalf of such party.

DATED AS OF August 24, 2011

The 737-900ER Aircraft is described by Boeing Configuration Specification [***].

The Detail Specification will be derived from the Baseline Aircraft Description as amended to incorporate the optional features accepted by Customer as more fully discussed in Letter Agreement DAL^-PA^-2022^-LA‑1104484 entitled “Open Configuration Matters for 737-932ER Aircraft”

The total prices for features included in the Aircraft Basic Price are as reflected in Table 1Q[***], [***], and [***] and include the following:

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The Aircraft Basic Price does not include the price effects of any Buyer Furnished Equipment or Seller Purchased Equipment.

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This Supplemental Exhibit BFE2 contains supplier selection dates, on-dock dates and other requirements applicable to the Aircraft.

Customer will:

Select and notify Boeing of the suppliers and part numbers of the following BFE items by the following dates:

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On or before [***], Boeing will provide to Customer the BFE Requirements electronically through My Boeing Fleet (MBF in My Boeing Configuration (MBC). These requirements may be periodically revised, setting forth the items, quantities, on-dock dates and shipping instructions and other requirements relating to the in-sequence installation of BFE. [***].

Customer will be the “importer of record” (as defined by the U.S. Customs and Border Protection) for all BFE imported into the United States, and as such, it has the responsibility to ensure all of Customer's BFE shipments comply with U.S. Customs Service regulations. In the event Customer requests Boeing, in writing, to act as importer of record for Customer's BFE, and Boeing agrees to such request, Customer is responsible for ensuring Boeing can comply with all U.S. Customs Import Regulations by making certain that, at the time of shipment, all BFE shipments comply with the requirements in the “International Shipment Routing Instructions”, including the Customs Trade Partnership Against Terrorism (C-TPAT), as set out on the Boeing

website referenced below. Customer agrees to include the International Shipment Routing Instructions, including C-TPAT requirements, in each contract between Customer and BFE supplier.

Customer currently operates an aircraft of the same model as the Aircraft. Upon Customer's request, Boeing will develop and schedule a customized Customer Support Program to be furnished in support of the Aircraft. The customized program will be based upon and equivalent to the entitlements summarized below.

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Boeing will revise, as applicable, technical data and documents provided with previously delivered aircraft.