Among them was Air Memphis, which did not have a permit - after Egyptian authorities failed to respond to "adverse ramp inspection findings" - to fly in UK air space from April 1999 to May 2002.

BBC: The downed Egyptian plane was banned from Switzerland

One is an air traffic controller in Memphis.

NPR: FAA Accused of Ignoring Safety Warnings

Two Delta Air Lines hubs also make the top 10: Cincinnati and Memphis, Tenn.

WSJ: Why It Costs So Much to Fly From These Airports

The Memphis-based company now has three distinct divisions: large ground freight, ground parcels and air express--with newly integrated information systems, sales and billing.

FORBES: Start the Ground War