On October 28, 1979, Allegheny Airlines was expanded greatly and changed its name to USAir. The new name, logo and livery was created by Landor Associates.
USAir was rebranded as US Airways on February 27, 1997. The namechange happened partly because the company wanted to present itself as a major airline. Most major airlines in the US have a name with "airlines" or "airways" in it, while names with "air" are usually used by smaller regional airlines.
US Airways merged with American Airlines in December 9, 2013 and moved to Oneworld on March 31, 2014. On July 13, 2015, American announced that it planned to discontinue the US Airways brand name on October 17, 2015. On that date, US Airways is scheduled to make the final flight for the airline as a red-eye from San Francisco to Philadelphia, taking off as US Airways Flight 434, and landing as American Airlines Flight 434.
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