Even know Gliders aren't a common thing in the world it would be still cool to have thermals added to the game, so you can fly in a glider like in the real world! Plus can add more physics in regards to how the plane can be controlled, and how stable it is. By the way, Thermals can be found by uses a Variometer (Verticle Speed Velocity, or VLS, which beeps faster the higher you go, beeps slower or a long beep when desending or idle) Locations of a thermal are, trees in a dry area, concrete surfaces such as roads and a runway, and Cumulus Clouds (they are like cotton on top, and flat as a square on the bottom.) Again a thermal would be helpful with a lot of builds, plus you could even add more aircraft parts like for a glider or a large aircraft!
I meant VSV lol.