Missouri has approximately 500 aviation facilities, including both public and privately owned airports, heliports, seaplane bases, and grass landing strips. Of those, approximately 140 are open to the public and 115 are publicly owned. Approximately 6,200 aircraft and 11,200 pilots are registered in Missouri. There are eight commercial service airports served by approximately 19 scheduled airlines that transport over 20 million passengers annually. The two primary commercial service airports are Lambert St. Louis International and Kansas City International. Springfield, Joplin, Columbia, Cape Girardeau, Kirksville and Fort Leonard Wood also have commercial service. There is 51.6 million sq. ft. of paved runway in the state, which is equivalent to a three lane highway from St. Louis to Kansas City. Twenty five runways have a length greater than 5,000 feet. In 1998, there were only five fatal accidents in over 2.4 million takeoffs and landings. Since 1990, MoDOT distributed over $80 million in state and federal grants for airport improvements, which included the construction of five new airports, six new runways, nine extensions and 18 rehabilitations. Over 160,000 tons of cargo are transported by air annually. The aviation industry employs over 16,000 people in Missouri.