00549nam 2200169z- 450 9910693732903321(CKB)4970000000042581(EXLCZ)99497000000004258120240129c2003uuuu -u- -engNational Airspace System : current efforts and proposed changes to improve performance of FAA's air traffic control systemWashington, D.CNational Airspace SystemDOCUMENT9910693732903321National Airspace System3424084UNINA