But anyway.

I don't think planes will help them much. They would be stuck doing what the Russian planes are doing, lobbing long range radar guided missiles from well inside Russian held territory at Ukrainian planes. If Russia can't operate in Ukrainian airspace due to Ukrainian AA then there is no way a few F-16s are operating anywhere near Russian airspace.

They could launch air launched cruise missiles but then you just have a HIMARS that flies and if the west is nervous about what range ammunition it gives HIMARs then it won't give anything that great to any F-16s either.

So planes would help but not that much.