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NEW YORK (CBS/AP) -- United Airlines says it will honor the tickets it accidentally gave away for free.

The decision is good news for people who snapped up the tickets on Thursday after United accidentally listed airfares at $0. Many customers got their tickets for $5 or $10, paying only the cost of the Sept. 11 security fee.

United isn't saying how many tickets it accidentally gave away, or how much the mistake cost. The wrong fares were available on its website for a few hours on Thursday. It eventually shut down bookings on its website until it could fix the problem.

Passengers reported buying the cheap tickets before United shut down the bookings on its website and phone centers to prevent more tickets from being sold or given away.

Such fare mistakes have happened before, often when an airline dropped a digit when entering fares into its computer system. That may be what happened here. United Continental Holdings Inc. spokeswoman Megan McCarthy said the mistake was due to an error in filing the fares, not a problem with the website. She said United doesn't yet know how many tickets were sold at the unusually low prices.

Maura Leahy, who lives in Houston, was booking a Christmas trip back to Washington to visit her parents on Thursday. The trip to Washington was $5. The return leg was $220, but it was still a cheap ticket.

But why wait. She decided to try booking a cheap flight to surprise her parents on Friday.

"It was $5 round-trip, no fees, nothing," she said. "This is nuts."

She checked in right away and printed her boarding pass hoping to increase her chances of being able to use the ticket.

Leahy said a co-worker scored a cheap flight to San Francisco while another got one to DC for later this year.

On one day in 2008, United accidentally dropped a fuel surcharge that ran as high as $130. It honored the tickets sold without the surcharge.

Today, Social media such as Twitter ensures that word of mistake fares spreads even faster than before.

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