As the changes start you gather a glimpse of your surroundings. You don't see any hangars or other obvious structures around you, but that could be because you are facing away from them. The runway seems to have been painted in some sort of camouflage, making it blend in with your surroundings. Suddenly the first change starts to take effect, something pushes out through your ass, ripping a hole into your pants. You reach back to feel it. You notice a sort of nozzle made out of several concentric blades. You notice a bulge forming on your chest, looking down to it you can make out it's cylindrical shape parallel to your body partly peeking out. Reaching for it you notice that it's hard and on the top there is some sort of indentation or hole. It's hard to make out more as your shirt still obscures that part of your body.
Not wanting to ruin more clothing you decide to strip first. As you hurriedly pull of your remaining clothes, you notice that your skin has changed its colour to a mid grey. The air intake of your engine is now clearly visible on your chest. You notice that you gradually feel your engine, not in a conventional sense, but through an increasing number of readings from the sensors embedded in it. Then your feet change, they get darker and darker while also melting into a blob. After a few moments they re-shape into rubber wheels, connected to his legs. Somehow this makes you horny as as your pressure builds up your privates undergo a similar change forming a singular wheel half embedded in your crotch. It starts to move upwards to your chest like the fin of a shark in the water. As it arrives it moves out in front of you and pushes out being held by another metal leg. You feel uncomfortable in your current position so you bend over and kneel down to gently place your weight onto your new landing gear. As you do so your thighs merge with your torso and your landing gear legs turn diagonally increasing the distance between your hind wheels.
Then you notice something happening on your face. Your nose pushes forward forming a pointed nose. Gradually your mind interfaces with the radar that is inside of it. Then you notice your arms getting wider and flattening into wings, at the same around your engine exhaust a set of tail rudders form. As these take shape you notice that you can move their control surfaces. On your back a glass canopy starts to push out. As your final major change your head merges into the shape of the plane with your eyes and mouth flattening and turning into an animated nose-painting like you'd find on a cartoon plane.
For a moment you black out just before you perceive the tail end of your systems booting up. Your mind now is just a program running on your computers, able to access all resources of it as well as your plane. While you remember this place being rather cold, its temperature is now well within specifications. You are now a plane, a heavily customized F16, a machine yet able to talk and emote via your seemingly painted on frace. "Woah" you intonate as you come to realize what happened.
The genie grinned at you before announcing, "Well that was just the easy part".