1.   How many years have we been flying that route?

2.   American has no authority to fly the route itself.

3.   Atlantic Coast Airlines next week will begin flying new routes from Washington-Dulles International Airport to Fort Myers and Jacksonville, Florida, and Nashville, Tennessee.

4.   Aviation relations between the U.S. and the Japanese have been deadlocked since last August, when the Japanese government refused to allow Federal Express Corp. to fly several routes.

5.   Besides American and United, four Venezuelan carriers fly routes to the U.S. from Venezuela.

6.   Air Canada also flies the route, through Toronto, and does not list percentages.

7.   Air travel has become common enough for many of us to have been on that model plane, or flown that route, or departed from that airport.

8.   Airlines starting to fly new routes or offering deep discounts will likely to be trying to unload free seats.

9.   Airlines use seniority to determine who flies popular routes at convenient times and who is stuck flying to undesirable locations on holidays.

10.   All twin-engine planes need FAA certification to fly such routes.