| Though the oil industry has historically dominated Tulsa's economy, efforts in economic diversification have created a base in the sectors of aerospace, finance, technology, telecommunications, high tech, and manufacturing. The Tulsa International Airport (TUL) and the Tulsa Port of Catoosa, the nation's most inland seaport, connect the region with international trade and transportation. An American Airlines maintenance base at Tulsa International Airport is the city's largest employer and the largest maintenance facility in the world, serving as the airline's global maintenance and engineering headquarters, while the Tulsa Port of Catoosa and the Tulsa International Airport house extensive industrial parks.
A number of large financial corporations are headquartered in Tulsa, the largest being the BOK Financial Corporation. The semi-national convenience store chain QuikTrip, the national car rental companies of Vanguard (parent to National and Alamo) and Dollar-Thrifty, and Mazzio's semi-national pizza chain also call Tulsa home. Many international oil and gas-related companies have headquarters in Tulsa, including Williams Companies, SemGroup, Syntroleum, ONEOK, Samson and Excel Energy. The Tulsa Metro Chamber reported in 2006 that there are 30 companies in Tulsa that employ more than 1,000 people. Tulsa also has an IC Bus factory (IC is a subsidiary of Navistar International). Tulsa Info Source
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