Delta Air Lines Worldwide Timetable April 4, 1999
MLA
Delta Air Lines, Inc.. "Delta Air Lines Worldwide Timetable April 4, 1999." Delta Flight Museum. 1999-04-04, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19990404.
APA
Delta Air Lines, Inc. (1999-04-04). Delta Air Lines Worldwide Timetable April 4, 1999. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19990404
Chicago
Delta Air Lines, Inc.. "Delta Air Lines Worldwide Timetable April 4, 1999." 1999-04-04. May 1, 2026. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19990404.
