In 1942, Austin J. Tobin became the Executive Director of the Port Authority. In the post-World War II period, the Port Authority expanded its operations to include airports, and marine terminals, with projects including Newark Liberty International Airport and Port Newark-Elizabeth Marine Terminals. Meanwhile, the city-owned La Guardia Field was nearing capacity in 1939, and needed expensive upgrades and expansion. At the time, airports were operated as loss leaders, and the city was having difficulties maintaining the status quo, losing money and unable to undertake needed expansions. The city was looking to hand the airports over to a public authority, possibly to Robert Moses' Triborough Bridge and Tunnel Authority. After long negotiations with the City of New York, a 50-year lease, commencing on May 31, 1947, went to the Port Authority of New York to rehabilitate, develop, and operate La Guardia Airport (La Guardia Field), John F. Kennedy International Airport (Idlewild Airport), and Floyd Bennett Field. The Port Authority transformed the airports into fee-generating facilities, adding stores and restaurants.