Delta Air Lines system timetables, 1934–2004
MLA
Delta Air Corporation. "Delta Air Lines system timetables, 1934–2004." Delta Flight Museum. 1934/2004, https://dlg.usg.edu/collection/delta_dal-tt.
APA
Delta Air Corporation (1934/2004). Delta Air Lines system timetables, 1934–2004. Retrieved from https://dlg.usg.edu/collection/delta_dal-tt
Chicago
Delta Air Corporation. "Delta Air Lines system timetables, 1934–2004." 1934/2004. July 29, 2025. https://dlg.usg.edu/collection/delta_dal-tt.
