Okay, I am happy that new mount is added, and it's a neat idea. But I think, making plane explode on contact with solid structure (Bulding, ground etc) is just bit stupid. The "Physics" of R2DA sometimes make plane explode on a small bump or just simply a delicate touch on walls with your wing cause a explosion that without Flak or other aromor that gives more HP makes you insantly die.
So I come up with some changes to the plane, maybe they are bit bad or OP aginst zombies, but I think Toy Plane could be a better mount.
1) Changing Explosion into not killing one.
Normal explosion of Toy Plane (Without Flak) will kill you insantly. How about we lower damage done by it? Damage that plane on explosion would do is 55. It is high amount, and still will keep players alive after crushing with plane at the beginning of the round.
2) Changing explosion into tripping.
This might be a bit stupid, but I think it may work. On any contact with solid object plane would just disappear and cause player to trip for 6 seconds (To not make it a straight upgrade)
3) Bumping will make Plane slower.
On each contact with soild structure plane will disappear and on next use it will be slower and won't be able to go on higher height. After 3 crashes plane will evetually explode.