US Airways (Phoenix) according to CNN has joined other carriers in filing for an exemption from the tarmac delay rule going into effect next month. The airline has asked the Department of Transportation (DOT) for a waiver to the rule for its Philadelphia hub.

The rule, set to go into effect on April 29, could fine the airlines $27,500 per passenger on domestic flights that sit on the tarmac for more than three hours with passengers on board.

US Airways joins Delta Air Lines, American Airlines and Continental Airlines in supporting a request by JetBlue Airways for a waiver at New York’s John F. Kennedy International Airport, which Continental expanded to include the New York area’s other major airports — Newark Liberty International and LaGuardia.

A construction project that has shut down one of JFK’s runways prompted the initial requests.

US Airways wants an exemption for PHL “because it shares the same airspace, is part of the same air traffic control center (New York Center), and has the same congestion challenges as JFK, LaGuardia and Newark,” according to a document filed with the Department of Transportation (DOT).

Read the full report:

edition.cnn.com/2010/TRAVEL/03/24/usairways.exemption.request/