The first five airlines of the Greater Pittsburgh Airport were TWA, Capital Airlines (later part of United), Northwest, All American (later Allegheny Airlines, then USAir, and finally US Airways), and Eastern Airlines. The April 1957 Airline Guide shows 58 weekday departures on Capital, 54 TWA, 18 Allegheny, 8 United, 7 Eastern, 4 Northwest, 3 American and 2 Lake Central. Eastern had nonstops to Miami, but westward nonstops did not reach beyond St Louis. TWA had an overnight Lockheed 1049G Super Constellation nonstop from Los Angeles ("Berths Available"). The first jets were TWA 707s on the LAX-ORD-PIT round trip in summer 1959.