49
Air France (reseau aerien, 1954)
(feddit.org)
Back when Flight maps looked detailed and well designed instead of boring and informative. If you want to look at the map in even higher resolution, it's available here.
It's not clearly stated on the map. I suspect dashed lines are either infrequent ones or lines served by partner companies.
I realise that modern maps are better at conveying the information that they are supposed to conves. But these older ones just look like adventure - more like an advertisement than purely informational.