Northwest Orient Airlines System Timetable 1979 December 18
MLA
Northwest Orient Airlines. "Northwest Orient Airlines System Timetable 1979 December 18." Delta Flight Museum. 1979-12-18, https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19791218.
APA
Northwest Orient Airlines (1979-12-18). Northwest Orient Airlines System Timetable 1979 December 18. Retrieved from https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19791218
Chicago
Northwest Orient Airlines. "Northwest Orient Airlines System Timetable 1979 December 18." 1979-12-18. October 10, 2026. https://dlg.galileo.usg.edu/do:delta_nwa-tt_nwa-tt-19791218.
