DALLAS - Delta Air Lines Inc. raised domestic air fares by $5 each way late Thursday, and American Airlines, the nation's largest carrier, matched the increase on Friday. So did smaller Alaska Air Group and Midwest Airlines, according to Neil Bainton of FareCompare.
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United Airlines, the No. 2 carrier, was studying the increases, said spokesman Jeff Kovick.
Northwest Airlines Corp., Continental Airlines Inc. and US Airways Group Inc. remained on the sidelines at midday Friday. A spokesman for Southwest Airlines Co. said the Dallas-based carrier had no plans to raise fares immediately.
It marked the third attempt at a broad-based fare increase so far in 2007. One of the previous two succeeded.
Fare increases are often tried late in the week, and they either take hold or fall apart over the weekend as other carriers adjust their prices. Airlines can raise fares one day and roll them back the next if rivals don't go along.