Since 2005 the International Civil Aviation Organization (ICAO) has required bird strikes to be reported and a database established in an effort to determine migratory patterns. This will aid in flight planning when flying into airports during certain times of the year. The U.S. Air Force uses a program called Bird Aircraft Strike Hazard (BASH). The program managers maintain one of the largest bird strike databases available with links to the FAA, USDA, Smithsonian Natural History, Bird Strike USA, and Bird Strike Canada. Also available on the Air Forces' website is Avian Hazard Advisory System (AHAS) which uses NEXRAD radar to track bird movements close to the ground in and around airports. The FAA has maintained a bird strike database available to all aviators since 1990. Listed below are links to some of the available bird strike databases.