21.   As a result, the airlines have had to depend on presumably more flexible leisure passengers to fill their seats.

22.   As a result, he says, the airlines now have more seats available for certain flights, so they put some of them on sale.

23.   As it stands, different airlines have different approaches to carry-on baggage.

24.   As required by federal law, airlines have guidelines for bumping.

25.   At that time, airlines had too much capacity and too few customers, leaving them with huge losses.

26.   Because airlines have the discretion to demand photo identification, some do so on a random basis.

27.   Because of the unpredictability of weather, airlines would have to adjust and cut back their schedules to fly without the aircraft until the temporary ban is lifted.

28.   Because different airlines will have difficulty selling different routes, there is no set range for the number of seats an airline will reserve for consolidators.

29.   Big airlines will spread extra costs over all their customers, she said, while small airlines do not have a huge customer base to do that with.

30.   Bill Berry, a spokesman for Delta Air Lines, the first carrier to impose the commission cap, said the airline had no comment about the apparent settlement.