After the conclusion of painstaking labor negotiations in 1997, US Airways sought to head off burgeoning competition from low-cost carriers in its strongest region, the U.S. Northeast. Competitor Southwest Airlines was encroaching from its base in the West as were Delta Express and AirTran Airways from the South. Like them it would offer a single class of service, operate a single type of aircraft, which consisted of the Boeing 737-200, and fly a limited network, based at the airline's Baltimore hub. Like similar projects from traditional carriers, including Continental Lite, Delta Express, and Shuttle by United, it would participate in the parent airline's frequent flyer program and other systems.

MetroJet was launched on June 1, 1998, flying from its base at Baltimore-Washington International Airport to Cleveland, Ohio, Providence, Rhode Island, Fort Lauderdale, Florida, and Manchester, New Hampshire. It began with five dedicated aircraft, repainted in a distinctive livery with a red and gray fuselage, and the traditional blue tail with the US Airways logo. It was slated for a measured expansion over the next two years that eventually included flights from Washington Dulles International Airport and several point-to-point operations, with an emphasis on connecting Northeastern passengers to destinations in Florida.

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