Some major U.S. airlines are trying to revive fare increases for high-end tickets after failing to impose bigger price increases last week.
Fare watchers say American, United and Continental raised prices Monday by $20 to $60 per round trip on some tickets favored by business travelers.
The increases are half the size of some that were briefly imposed last week, then rolled back after US Airways decided not to raise prices.
The airlines are dealing with roughly a 50 percent increase in spot prices for jet fuel in the past year.
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