Create & Download Your Individual Flight Map » Travel-Dealz
Mapping Airways: The World's Flight Paths and Airports
The Airline Blog: Create a flight map of your travels
How To Make Flight Maps - One Mile at a Time
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