Major U.S. airlines matched a United Airlines fare hike that raised walk-up fares by as much as $60 roundtrip

based on flight distance, according to price watchers. Tom Parsons of BestFares.com noted that "travelers flying between two non-competitive markets over 1,500 air miles [on routes not served by AirTran, Frontier, JetBlue, Southwest, Spirit and Virgin America] now pay $340 roundtrip more than they did on December 20, 2007." FareCompare's Rick Seaney this weekend reported that "American Airlines also increased what appears to be mostly Southwest overlap routes by $6-$8 roundtrip."