I just got my LC after two and half year waiting. :-( The lawyer of my company told me that I won't be able to utilize AC21 if I file I-140 and I-485 concurrently as both of them will be approved at the same time now. In order to use AC21, you have to have I-140 approved and I-485 pending. Just wonder if his information is accurate as I saw some people on this forum are talking about using AC21 while did the concurrently filing. Thanks