Delta Air Lines System Timetable April 2, 1989
MLA
Delta Air Lines, Inc.. "Delta Air Lines System Timetable April 2, 1989." Delta Flight Museum. 1989-04-02, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890402.
APA
Delta Air Lines, Inc. (1989-04-02). Delta Air Lines System Timetable April 2, 1989. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890402
Chicago
Delta Air Lines, Inc.. "Delta Air Lines System Timetable April 2, 1989." 1989-04-02. May 4, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19890402.
