Airlines boost fares

Associated Press

DALLAS

The big U.S. airlines are raising base fares by $10 per round trip on some domestic routes with the busy summer travel season just around the corner.

United, Continental, Delta and American raised prices, but some of the low-cost carriers had not matched the increases by Friday afternoon.

The airlines face sharply higher costs for fuel, one of their biggest expenses. They have pushed through at least six broad price increases this year, but the last two in March failed when some airlines declined to go along.