Hi!
DAL has said in numerous press releases that the MD-90 is by FAR their lowest seat-mile cost of ANY of their narrow body jets, so they want as many as possible. They were planning on acquiring 74 of them, but that was WITHOUT the Saudia jets...so could be as many as 102. Boeing should have kept the 717 line open, and added the 717-200 as AirTran wanted. Now they will be getting their 737 ass kicked by Bombardier's "C"!
The lowest seat-mile cost of ANY of their narrow body jets is the 757...