They have moved toward selling larger jets - a business that Piper is not in.
It must have come off a very large jet.
The two large jets apparently came within 100 feet of each other, and possibly much less.
The neighbors said that much larger jets sometimes come and go from the airport after midnight.
This year, 129 used large jets have been sold, the same as last year, the companies said.
The company is now developing a new, larger regional jet.
It has since added back one large jet on the run.
They then began training to fly large jets on a flight simulator.
By contrast, pilots who fly Delta's large jets average about $150,000.
The 777 will be the world's largest twin-engined jet when it goes into service in 1995.