Delta Air Lines System Timetable 1974 April 1
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1974 April 1." Delta Flight Museum. 1974-04-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19740401.
APA
Delta Air Lines, Inc. (1974-04-01). Delta Air Lines System Timetable 1974 April 1. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19740401
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1974 April 1." 1974-04-01. May 2, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19740401.
