Visualizing Airline Routes and Hubs – Saumik Narayanan
Delta Air Lines Route Map for the US & Canada : r/MapPorn
Flight routes and map projections - Datawrapper Blog
The Design History of Airline Flight Maps - Bloomberg
Airline routes on map infographic Royalty Free Vector Image
Route Maps – Independence in the Air
Open-source airline route maps from 1999 and 2018 created using Python and BTS data (see corresponding comment for clarifications + GitHub link) [OC] : r/dataisbeautiful