www.algodoo.com

The lag can be eliminated by making the runways stop being rulers.

I may bite, but the scene is seriously unnecessarily large, the obstacles are pointlessly easy, and the weight of the cargo is ridiculous. Algodoo doesn't really work too well with aerodynamics and realistic weight.

That's okay, friendly criticism is good. I might improve this contest if people actually enter it. And the weight of the planes can be easily handled if you increase the density of whatever you are using to transport them. Thanks.