Delta Air Lines System Timetable 1941 April 15
MLA
Delta Air Corporation. "Delta Air Lines System Timetable 1941 April 15." Delta Flight Museum. 1941-04-15, https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19410415.
APA
Delta Air Corporation (1941-04-15). Delta Air Lines System Timetable 1941 April 15. Retrieved from https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19410415
Chicago
Delta Air Corporation. "Delta Air Lines System Timetable 1941 April 15." 1941-04-15. August 7, 2025. https://dlg.galileo.usg.edu/do:delta_dal-tt_dal-tt-19410415.
