In a recent update, they did improve the aircraft controls a bit, but they can be better. Keepthe plane sensitivity at 1 and keep tthe throttle up (w), throttle down (s), turn left (a), and turn right (d) the same. For the plane pitch forward, you want it to be Mouse Y- and for the plane pitch back, you want it to be Mouse Y+. And finally for plane roll left, you want it to be Q and for the roll right, you want it to be E. Now you have improved flight controls!

Hope you found this guide helpful!
Please rate and recommend!