Delta Air Lines System Timetable 1980 July 19
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1980 July 19." Delta Flight Museum. 1980-07-19, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800719.
APA
Delta Air Lines, Inc. (1980-07-19). Delta Air Lines System Timetable 1980 July 19. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800719
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable 1980 July 19." 1980-07-19. May 16, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19800719.
