A Delta Air Lines jet takes off from Boston's Logan International Airport. United and Continental airlines started the push for another fare increase last week and were joined by Delta, American and US Airways. But low-cost airlines didn't go along. By Monday morning, US Airways was the only one of the major airlines that still had the higher fares. (AP Photo)

A Delta Air Lines jet takes off from Boston's Logan International Airport. United and Continental airlines started the push for another fare increase last week and were joined by Delta, American and US Airways. But low-cost airlines didn't go along. By Monday morning, US Airways was the only one of the major airlines that still had the higher fares. (AP Photo)