As WHBM pointed out the Timetable Images site have vastly expanded their online complete timetable feature....plenty of Pan Am examples....I couldn't find a Dakar to NY direct service but the NY-Azores -Lisbon-Dakar -Leopoldville-Jo'burg route is featured as is the use of Ascension Island back in 1947 (Constellations, maybe?)
http://www.timetableimages.com/ttima...47/pa47-07.jpg