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.