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US Airways will soon officially be no more. The airline that started as a tiny airmail service 76 years ago is retiring as part of a 2013 merger with American Airlines. The final US Airways flight is scheduled to take off from San Francisco Friday night on a red-eye flight that will land in Philadelphia on Saturday morning. The airline is only the latest in a long line of airlines that have gone the way of the dinosaurs and are now extinct. Here are some of the more memorable ones.