Despite the additional planes, Delta spokesman Trebor Banstetter also said the company is not adding flight capacity amid slow travel demand. That's because it is pulling so many other aircraft from its fleet, including DC-9s inherited from Northwest Airlines and regional jets. Delta has nearly 800 mainline aircraft in its fleet.
"It's not a growth decision," Banstetter said. The addition of more of the efficient MD-90s, is "much more a fleet management type of move," he said.
"It's certainly a lot more affordable for us than if we were to, say, buy a new 737," Banstetter said. He said the MD-90s will get new interiors.