MINNEAPOLIS – Baggage fees have sneaked out of the belly of the plane and into the overhead bin.

Spirit Airlines will charge as much as $45 each way for a carry-on bag starting Aug. 1. Personal items like purses and laptop computers that fit under the seat will still be free.

The new fee makes Spirit the first airline to charge passengers to haul their own possessions onto its planes. It’s sure to seize the attention of passengers, as well as airline executives who are probably glad that Spirit tried it first.

“I didn’t think anyone would go this far,” said Jay Sorensen, an airline consultant who specializes in airline fees.

Industry observers said Spirit’s move doesn’t mean it will spread to the big airlines. None of the major carriers changed their fees Tuesday.

Spirit’s new charge for a carry-on is $45 if paid at the gate, and $30 if paid in advance. Spirit said Tuesday that it reduced its lowest fares by $40 on average, so most customers won’t really pay more to fly.

Customers who pay for space in the overhead bin will also get to board the plane earlier. The new policy limits paid carry-on bags to one per passenger.

Spirit CEO Ben Baldanza said having fewer carry-on bags will help empty the plane faster. He said the idea is to get customers to pay for individual things they want, while keeping the base fare low.

“The beauty of it is they will do what they think is best for them and will now have the choice,” he said.

Spirit is based in Miramar, Fla., and is privately held. Most of its flights carry leisure travelers from big airports in the U.S. through Fort Lauderdale and on to Latin America.

Like Ryanair in Europe, Spirit has relatively low base fares but charges lots of add-on fees, including $16 per round-trip ticket to book at its Web site. It has fewer than two dozen planes. Its 150 daily flights are about one-twentieth as many as American Airlines and its regional partners offer.

Even though Spirit is a minor player, big airlines will watch it to see whether customers are willing to pay for carry-ons, Sorensen said. “It’s a potential source of revenue for an industry that still needs it,” he said.

The problem with charging for checked luggage but keeping carry-ons free is that passengers lug as much onto the plane as they can, he said. Spirit’s move does help solve that problem, Sorensen said.

Spirit said it will add measuring devices at gates to determine which carry-ons are free and which ones will incur the charge. Things like diaper bags, umbrellas, strollers and reading material won’t count as a passenger’s free personal item.

The big airlines stepped gingerly when they started charging to check baggage in 2008, making a move, then watching to see who matched it. Now, all of them charge to check a bag on domestic flights except Southwest (two free bags) and JetBlue (one free bag).

Spirit CEO Baldanza said he’s confident the airline will stick with the new carry-on fee. “Our decision to do it isn’t dependent” on other carriers following along, Baldanza said.

He said he doesn’t see the bag fee as a revenue boost as much as an operational help. Dealing with large carry-ons has delayed departures and slowed down unloading after a flight.

While it’s too soon to know whether passengers will accept the carry-on fee, it actually makes sense to encourage them to check bags as Spirit has done, said Genevieve Shaw Brown, senior editor at Travelocity.

Ever since checked bag fees began, “the boarding process has become more chaotic There’s more tension among travelers fighting for space in the overhead bin,” she said. “It also becomes less efficient to board and deplane, which is not good for airlines that make money on being efficient.”


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