If you want to start college in fall 2014, you would apply in fall 2013.
However, I want to warn you that most aerospace engineering jobs in the US require a security clearance. Foreigners are not eligible for a security clearance and you should plan on leaving the US after you have completed your education. (If you were planning to do that anyway, great! I just wanted to say this because many international students posting on this board are secretly hoping to emigrate to the US.)