It's about two or three weeks when I've sent an e-mail for consideration of our new squadron, but I still have no reply.Why?

If you mean to the IL2 website, its not been udpated in years so don't expect to hear back from them. Best thing to do is to post in Billfish's topic and she will add you to that community generated list - its the only list that is still updated bar a few small independant lists.
V