1979 - September 5 - National Airlines Timetables, Route Maps and History.
National Airlines Timetables, Route Maps and History - September 5, 1979:
Four months before the ill-fated merger with Pan Am, this was the final National timetable and map. Pan Am and Texas Air Corporation bid up the National stock to such an extent that the winner would financially be the loser. National's last new service to be introduced was San Juan, Puerto Rico.