http://www.timetableimages.comArchived 2017-09-12 at the Wayback Machine, April 24, 1966 & July 1, 1986 Braniff International Airways system timetables; Jan. 15, 1956 Continental Airlines system timetable; Sept. 30, 1966 Delta Air Lines system timetable; June 1, 1980 Alaska Airlines system timetable; April 24, 1966 United Airlines system timetable; March 2, 1962 National Airlines system timetable; June 1, 1969 Pan Am system timetable
http://www.timetableimages.comArchived 2017-09-12 at the Wayback Machine, April 24, 1966 & July 1, 1986 Braniff International Airways system timetables; Jan. 15, 1956 Continental Airlines system timetable; Sept. 30, 1966 Delta Air Lines system timetable; June 1, 1980 Alaska Airlines system timetable; April 24, 1966 United Airlines system timetable; March 2, 1962 National Airlines system timetable; June 1, 1969 Pan Am system timetable