ATLANTA – U.S. airlines never met a fee they didn’t like. Until now, it seems.

Five major carriers Sunday agreed not to follow the lead of a small Florida airline that plans to charge for carry-on bags. Their commitment comes just in time to keep travelers from running for the exits during the peak summer flying season, but it is doubtful that it marks a change in strategy.

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Passengers on airlines other than Spirit won’t be paying carry-on fees, but Spirit CEO Ben Baldanza argues that his fare discounts more than offset the carry-on fee. 2009 Associated Press file

Airlines are going to tack on every fee they feel they can get away with because it bolsters their revenue stream while allowing them to keep base fares lower. They just don’t feel like passengers will tolerate losing their sacred free carry-ons — at least not right now.

The promise to Sen. Charles Schumer, D-N.Y., from American Airlines, Delta Air Lines, United Airlines, US Airways and JetBlue Airways comes although some of those same airlines are expected to report first-quarter losses next week.

Ancillary fees for air travel — including baggage fees, reservation change fees and other miscellaneous operating revenue — have been piling up.

For U.S. carriers, they totaled $1.95 billion in the third quarter of 2009, roughly 36 percent higher than for the same period a year earlier. For 26 large U.S. airlines, those fees made up 6.9 percent of their total operating revenue in the third quarter of last year, according to the most recent federal data available.

But major carriers risk alienating customers if they follow Spirit Airlines’ lead and impose a fee on carry-on bags. In August, Spirit will begin charging customers up to $45 to place a bag in an overhead bin.

Other fees haven’t stopped people from flying, but many can be avoided. Carry-on bag fees would be hard to avoid.

“We believe it is something that’s important to our customers and they value, and we will continue making that available to them at no charge,” American Airlines spokesman Roger Frizzell said.

It wasn’t clear how long the five airlines had pledged not to charge for carry-ons. Frizzell couldn’t say, and a spokesman for Delta declined to comment.

Schumer and five other senators back legislation that would tax airlines if they charge carry-on bag fees.

Schumer said the legislation will move forward until it becomes clear that no airline will institute the charges.

He will have an uphill battle changing the minds of Spirit executives when he meets with them soon.

Spirit CEO Ben Baldanza said Sunday that his airline is moving ahead with its carry-on bag fee.

He said his competitors’ decision actually puts pressure on those airlines because Spirit has lowered its fares more than the price of the new fee.

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