US Airways 2007 Annual Report Download - page 215

2.2 Customization Milestones Chart
Within a reasonable period after signature of this Agreement, the Seller will provide the Buyer with a chart called the "Customization Milestones Chart"
defining the lead times before Delivery needed for agreeing on items requested by the Buyer from the Standard Specifications and Configuration
Guides CD-ROM.
2.3 Propulsion Systems
2.3.1 New Aircraft Propulsion System
The Buyer shall select the Propulsion System to be installed on each New Airframe in accordance with this Clause 2 no later than **months before the
first day of the Scheduled Delivery Month of the first New Aircraft for each type of New Aircraft.
2.3.1.1 A319 New Aircraft
The Buyer shall select either one set of CFM International 56-5B6/P propulsion system (the "A319 CFM Propulsion System") or one set of
International Aero Engines V2524-A5 Propulsion System (the "A319 IAE Propulsion System").
2.3.1.2 A320 New Aircraft
The Buyer shall select either one set of CFM International 56-5B4/P propulsion system (the "A320 CFM Propulsion System", or one set of
International Aero Engines V2527-A5 propulsion system (the "A320 IAE Propulsion System").
** Confidential Treatment Requested.
USA — Amended and Restated Airbus A320 Family Purchase Agreement PA — 20 of 123
EXECUTION PRIVILEGED AND CONFIDENTIAL