Maybe if the window was open they would all fly away.

I had to get used to him always flying away.

How did they know when he was strong enough to fly away with them?

Then he moved his arms as if to fly away.

All my trouble was gone, and I wanted nothing but to fly away with them.

Because once I've taken over your population it's going to be easy to fly away.

He was able to kill two more before they flew away.

However, if you release them during the day they will just fly away.

Suddenly an F-14 flew by not five hundred feet away.

Only then could he be certain that the ship would not fly away, for any reason.