I noticed the liftoff mod has not been updated for 0.17, so I made my own
Features
Everything can be configured, enabled and disabled from the ingame mod settings
Takeoff and landing
Planes need to reach their set takeoff speed to takeoff, otherwise it will collide into other objects
Slow down too much and the plane will land, colliding into any objects in the way
Realistic turn radius
Widens the turn radius of planes, planes can no longer spin on the spot
Realistic acceleration + braking force
Slower acceleration and braking to feel more like a plane instead of a race car, requiring actual runways to takeoff and land
Realistic debris damage
Rocks, tree stumps and other objects will now damage the plane more on takeoff and landing
Environmental damage
Hitting cliffs and running into water on takeoff and landing will instantly destroy the plane
Jumping out of a flying plane will cause it to crash
Pollution
Planes emit pollution depending on their fuel type and speed
Plane statistics
Gunship: Medium takeoff, medium maneuverability
Cargo plane: Short takeoff, low maneuverability
Jet: Long takeoff, high maneuverability
Flying fortress: Medium takeoff, high maneuverability
Credits
SuicidalKid - Part of the plane icon seen in the thumbnail