m78768:
1. If the employer only files I-140 ask him to file for CP option AOS is going to take a long time, if employer does not agree then fileI-140 with for AOS option
2. Once you get I-140 receipt you can file I-485 (even with out employer letter, they will ask for the employer letter at the last stage if not submitted with I-485)
sn99:
“If they file concurrently, you may leave them after 140 approvals (using AC 21 portability”
When the AC21 law was passed there was no Concurrent filing, To take the advantage of AC21, your I-485 should be pending for 180 days AFTER the I-140 approval date, you can not use AC21 if you filed I-140, I-485 concurrently and are pending more than 180 days, I-140 has to be approved and then count the days after I-140 approval date for pending I-485