** FILE ** One Comair plane takes off while another Comair plane taxis to the terminal at the Greater Cincinnati/Northern Kentucky International Airport in Hebron, Ky. in this July 26, 2006 file photo. As air traffic increases, the nation's air traffic controllers and the Federal Aviation Administration that employs them cannot agree whether enough qualified people are guiding aircraft traffic or how safe air space is today. (AP Photo/Al Behrman, File)