About TWA:

Trans World Airlines (TWA) was a major airline in the United States that operated from 1930 until 2001 when it was acquired by American Airlines. It was formed as Transcontinental & Western Air to operate a route from New York City to Los Angeles via St. Louis, Kansas City, and other stops, with Ford Trimotors. With American, United, and Eastern, it was one of the "Big Four" domestic airlines in the United States formed by the Spoils Conference of 1930.

About the Boeing 737-300:

The prototype of the -300 rolled out of the Renton plant on January 17, 1984, and first flew on February 24, 1984
After it received its flight certification on November 14, 1984, USAir received the first aircraft on November 28.