Quote Originally Posted by grafrich View Post
"птица залетела в окно" the bird flew into the window (through the open window?
Yes, it' correct.
Also it can be said as "влетела В окно".
"птица налетела в окно" the bird flew into the window (closed window... и свернула себе шею?)
Welll, it is not correct.
"На-лететь" is not very close to "за-лететь" (and it's not the same as 'на-летать').
Well, it's perfect verb, but mental idea is not about crossing border (reaching border), but about strike in object/border from the flying state.
Налететь is about man who run fast in the crowd and hit with the chest another man. He is "налетел на" - like flying object falling from the skies hit something.
'Spaceship налетел на asteroid' is another good example.
But all of this requires particle "на". Implying "hit from above".
"налететь в" is incorrect.