since I am a person who wants the flight in Infinite Flight to be as realistic as possible, I had struggles to find routes which are usually flown in real life and the airlines which operate them as well as callsign, aircraft type and more.
Usually you can simply go to FlightAware.com and you get all the information you need. However, since most airlines cancel most of their flights due to the COVID-19 crisis, you will get the response from FlightAware that no flight operating the route was found even though usually the route is operated.
I know Eurowings flies nonstop from EDDL (Düsseldorf) to LEAL (Alicante) but this is what FlightAware says:
Then I go to Flightradar24 in order to get my information there but it also says that no flight on the route EDDL-LEAL was found:
But here comes the trick. At the top you can see the callsign which is used for this route. This also gives you the airline which usually operates the route. For more information, search for this callsign on FlightAware.com and you‘ll get a result for the last flight on this route:
Now you know that this is a RL-route and you have information on the aircraft type, flight time, gate and more. I tried this with multiple routes and it always worked.
I hope this is helpful for some of you guys. Stay safe all!