1.   Geodesics on a spherical surface are the well known great circle routes which are frequently used by airlines on intercontinental flights.

2.   The airlines use stronger language to discourage them.

3.   Most airlines are using electronic ticketing now.

4.   American Airlines pilots, though, say they fear that the airline will use the planes to replace bigger jets on routes that they now fly.

5.   And then there are the terminals like the British Airways building, which is actually used by several different airlines.

6.   Another big gainer was Invision, the Foster City maker of scanning equipment used by airlines to check luggage for explosives and weapons.

7.   Because airlines use different names for various membership tiers in their frequent flier programs, alliance members will use emerald, sapphire and ruby to designate advanced plan levels.

8.   Beyer said that struggling airlines frequently use bankruptcy threats as leverage against labor unions and creditors.

9.   Advance seat assignments can be confirmed, following the same requirements each airline uses for paper-ticket purchases.

10.   Air-fare prices can fluctuate from day to day, largely because airlines use sophisticated yield-management techniques to track sales and adjust prices.