What occupant of The Sundrome was based in Indianapolis, Indiana? 
Sundrome:  It had been occupied at various times by Trans World Airlines (domestic flights), Pan American World Airways, United Air Lines (domestic flights), ATA Airlines, Pan American Airways (1996-1998), Carnival Airlines and Vanguard Airlines. ATA Airlines: ATA Airlines, Inc. – formerly known as American Trans Air and commonly referred to as ATA – was an American low-cost scheduled service and charter airline based in Indianapolis, Indiana.
ATA Airlines