A new era in commercial aviation flew into being last week on Delta Air Lines' Flight 529 from Atlanta to Memphis and Kansas City. The plane that made the flight was Douglas' new, short-range DC-9 jet, flying its first commercial schedule. The DC-9 not only starts the process of bringing swift jet service to hundreds of U.S. cities too small for big, long-range planes, but may also prove to be one of the most efficient planes in the air.
The twinjet, 560-m.p.h. plane can land on a 4,250-ft. runway (v. about 7,000 ft....
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