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Two subsequent mid-air collisions between military aircraft and commercial airliners, one near Las Vegas, Nevada (United Airlines Flight 736) on April 21, 1958, where 49 died, and one involving Capital Airlines over Brunswick, Maryland a month later on May 20 that cost 11 lives, showed further imperfections in the regulation of air traffic, particularly the need for unified control of airspace for civil and military flights.
The first five airlines of the Greater Pittsburgh Airport were TWA, Capital Airlines (later part of United Airlines), Northwest, All American (later it become Allegheny Airlines, USAir, and finally US Airways), and Eastern Airlines.