11.   Delta plans to begin this service later this year, starting at its hub airports in Atlanta, Cincinnati, Salt Lake City and Dallas-Fort Worth.

12.   Dominant airlines are able to shut out new entrants at their main hub airports by using their influence to stop expansion and by signing long, exclusive gate leases.

13.   Even Virgin, which has pursued a strategy of creating a network of thin routes, sees the need for a super-jumbo to ease congestion at hub airports.

14.   Fliers could also expect more high-handed treatment from airlines that enjoy de facto monopolies at major hub airports, they say.

15.   For now, the technology is being tested only on cargo planes flying between certain hub airports in the Midwest and on small general aviation aircraft in Alaska.

16.   Frederick W. Smith, chairman and CEO of FEDEX Corp., said the federal government needs to limit the number of flights at hub airports at peak hours.

17.   He foresees an accelerating shift away from the strictures of the current commercial air system, driven partly by growing dissatisfaction with flying from major hub airports.

18.   Hub airports, located in larger cities, are usually dominated by one airline that serves smaller cities in the region.

19.   Hub airports dominated by a single airline have significantly higher fares than airports where several airlines compete, testified Steven Morrison, an economics professor at Northeastern University.

20.   In fact, one of the federally commissioned studies found, only their existence prevents the majors from raising fares sky-high at hub airports.