Use the up and down arrow keys to move. Not W or S. Note that the hitboxes are squares around the airplane. This might or might not be fixed. Happy Birthday!
Disclaimer: This game is not intended to make fun of those people who were killed in the 9/11 terrorist attacks on the WTC, Pentagon, and that random farm. It is made for the purpose of entertainment and challenge. You may note that you do not want to jihad the towers to the ground.