How Long Can Airline Bag Fees Carry On?

CHARLOTTE, N.C. -- Large airlines are reporting millions of dollars of new revenue from recently introduced bag-checking fees, but whether the practice can continue remains an open question.

While the fees have benefited the carriers where they've been implemented, two members of the group have been strongly opposed to the move. One is Southwest(LUV Quote), the world's biggest airline by passenger count. The other is Delta(DAL Quote), which is poised to become the largest carrier in terms of revenue passenger miles after it merges with Northwest(NWA Quote).

Perhaps the most telling comment on the charge was offered by Southwest CEO Gary Kelly during last week's earnings conference call. He said reservations agents tell him the first question they routinely hear from customers is, "Do you charge to check a bag?"

Because Southwest doesn't, it's gaining passengers, Kelly says. "We never had thoughts that we would charge to check a bag," he says. "We carry more passengers than anybody in the world, and we would probably have a customer revolt on our hands."

In fact, soon after American Airlines parent AMR(AMR Quote) introduced its concept of charging for the first bag in May, Southwest unveiled a new marketing campaign that proclaimed "Fees Don't Fly With Us" and "Bags Fly Free."

Delta has not been quite so blunt, but its lack of enthusiasm is quite clear. Asked about the first bag fee on the carrier's earnings conference call two weeks ago, President Ed Bastian responded: "We will continue to study it, but we have no plans to implement it at this point."

Last week, Delta took a step that led not so subtly to the conclusion that it has no interest in the first bag fee, saying it will charge an industry-high $50 for the second bag, twice what most others demand, and reiterating it will not charge for the first bag.

"While we need to help offset the unprecedented spike in fuel costs, we believe customers should be allowed to check a bag and [also] carry on a bag and a personal item free of charge," says spokeswoman Betsy Talton. In general, airlines say, about 50% of passengers check a first bag. Talton said fewer than 20% of Delta customers check a second bag.