If the Dreamliner had been delivered as planned in 2008, Boeing would have had the cash and engineering resources to have been well along, in 2010, in the development of a replacement for the 737. That had been its plan as far back as 2002, when Mulally had assigned a team to investigate potential future planes in a project code-named for national parks. “Y1” in the Yellowstone project would have been a new single-aisle aircraft to supplant the then-thirty-year-old 737. With delays on the Dreamliner, however, those plans had long since been shelved.
