I AM STILL IN BEGINNERS MODE. AM SELECTING ROUTES, TIMES, LEASING AIRCRAFT BUT I CANNOT FIGURE OUT HOW TO ASSIGN AN AIRCRAFT TO A ROUTE. HELP!
If you have already created the route (route has to be created for a specific aircraft fleet type (let's say A320), then you go to the scheduling page (Routes -> Scheduling)
Then, on the row of one of the A320 aircraft, click the "+" icon (on the far left) which will bring up the route that you created previously. Check it, confirm and that's it.
There's also the Manual, which you should read to learn the basics of playing the game: https://www.airwaysim.com/game/Manual