 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 . 
