Delta Air Lines System Timetable 1980 April 27
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1980 April 27." Delta Flight Museum. 1980-04-27, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800427.
APA
Delta Air Lines, Inc. (1980-04-27). Delta Air Lines System Timetable 1980 April 27. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800427
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1980 April 27." 1980-04-27. May 15, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800427.
