This is the latest revision of the original purchase agreement from 1997 when the original 777 order was placed. This amendment is for the 20 737-900ers we (aren't but) are getting now, along with the EMB190s we are (not) getting. Nothing new, sorry to disappoint but does it matter? Really? Were we planning on approving an aircraft purchase order in some way? (A power pilots never had and never will) Kryptonite?

This Supplemental Agreement No. 17 ( Supplemental Agreement ) dated as of December 16, 2015 amends Purchase Agreement No. 2022 dated as of October 21, 1997 ( Purchase Agreement ) between The Boeing Company ( Boeing ) and Delta Air Lines, Inc. ( Customer ) relating to the purchase and sale of Model 737NG aircraft. The Purchase Agreement incorporates the terms and conditions of the Aircraft General Terms Agreement dated as of October 21, 1997 between the parties, identified as AGTA‑DAL ( AGTA ).

PURPOSE:

Incremental Purchase . Boeing agrees to sell and Customer agrees to purchase twenty (20) model 737-932ER aircraft ( Incremental Aircraft ). The parties further agree to the addition of ten (10) put options as described in DAL-PA-02022LA-1501328, and to cancel all remaining Model 737 options described in DAL-PA-02022-LA-1105858. Unless otherwise indicated, Incremental Aircraft, and any exercised Put Option Aircraft, become Aircraft, 737-900ER Aircraft or Firm Aircraft, as the context requires, for the purposes of this Purchase Agreement.

The interesting stuff starts on page 175. Or Exhibit 10.18