Delta Air Lines System Timetable December 15, 1989
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable December 15, 1989." Delta Flight Museum. 1989-12-15, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19891215.
APA
Delta Air Lines, Inc. (1989-12-15). Delta Air Lines System Timetable December 15, 1989. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19891215
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable December 15, 1989." 1989-12-15. July 31, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19891215.
