The cost of spring break travel is soaring, and travelers are responding by taking shorter trips.

"People are shortening their vacations to afford them," says Amy Ziff, editor-at-large at Travelocity, the No. 2 online travel agency. "Travel's expensive again."

For the first time in six years of tracking its bookings, Travelocity this year has seen the average duration of spring break trips fall below five days.

The 4.9-day average in 2007 is down nearly 7% from a year ago, and down nearly 17% from 2002. That's a reduction of one full day since tracking began. The averages measure domestic and international trips booked for late February and March.

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