different opinions
Jim Mills:
"INS has stated (they do not seem to be following this in all cases so it is very up in the air right now) that it will not approve I-140s for concurrently filed cases until it adjudicates the I-485 (again, I know that they are not following this in some cases, I'm just reiterating what INS has said) and that the 180 day clock for AC21 purposes would not start until the I-140 is approved. This effectively would mean that AC21 would not apply to concurrently filed cases since the I-140 and the I-485 would be approved at the same time."
I apologize but I plainly think that INS has made a typo. What they meant should have been "I-485 won't be adjudicated until underlying concurrent I-140 is approved", and they are of course betting that I-485 always takes longer. This makes much more sense. INS made typos earlier, e.g. a couple months ago VSC processing time for I-485 was suddenly listed as "9/15/2002" instead of "9/15/2001". Personally, I am quite convinced that that is what they were trying to say.
Concurrent filing:
I think that if AC21 enables us to "not get penalized for switching jobs because INS has failed to adjudicate I-485 in 180 days", and concurrent filing gives us the benefit of receiving I-485 benefits such as AP and EAD sooner (without waiting for I-140), I would think the whole 180-day-switch-your-job benefit should start from the I-485 filing date regardless of when the I-140 is approved. Otherwise the intent of concurrent filing will be harmed, won't it? And in immigration law (also on a case-by-case basis), isn't "intent" one of the big words?
Concurrent I-140 processing times:
I have applied for concurrent EB2 I-140/I-485/I-765/I-131 (with labor substitution) at VSC toward the end of August 2002. My I-140 was approved October 22nd, and I got AP and EAD a few days later. I think, based on a recent INS VSC memo, that initially VSC has promised to "quickly adjudicate concurrent I-140s <90days to enable issuance of AP and EAD and eliminate frivolous concurrent-for-the-sake-of-EAD filings", (my I-140 receipt notice listed processing times as 60-90 days) but later the applications became so many that they "can no longer quickly adjudicate concurrent I-140s and can only preview them within the 90-day timeframe". That would explain why for a few months concurrent I-140s seemed to go so fast.
I am not a lawyer, these are merely personal guesses that I have come up with based on reading from different sources.