If you buy a nonrefundable fare on most airlines, it will cost you $100 to cancel or make a change.

The nonrefundable fares require a stay of 7 to 30 days.

But passengers would be required to buy the nonrefundable fare at least 14 days in advance, instead of the 30 days proposed by other carriers.

The nonrefundable fares apply to round-trip flights; tickets must be purchased by May 31.

For a nonrefundable fare, it may be worthwhile to buy travel insurance, even though it increases the cost of your trip.

The nonrefundable fares apply to round-trip flights with reservations made at least seven days before travel.

But I think with these moves on nonrefundable fares, they've now shot themselves in the foot.

T.W.A. said it would cut nonrefundable fares by up to 30 percent in most markets.

Nonetheless, Delta offers the nonrefundable fares to remain competitive, he said.

The new nonrefundable fares will be available in 475 of America West's 1,000 markets.