Delta Air Lines System Timetable June 1, 1989
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable June 1, 1989." Delta Flight Museum. 1989-06-01, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890601.
APA
Delta Air Lines, Inc. (1989-06-01). Delta Air Lines System Timetable June 1, 1989. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890601
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable June 1, 1989." 1989-06-01. May 9, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890601.
