 Tulsa's aerospace industry is substantial and growing. 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 transit-focused industrial parks. Tulsa is also home to a division of Lufthansa, the headquarters of Omni Air International, and the Spartan School of Aeronautics.
