That makes sense since there aren’t two weeks left in the month, although I can’t imagine the process being accelerated even if they took an earlier slot. Maybe the two week lead time before was more due to Jetblue and not Airbus.

Looks like two in-progress aircraft have been registered already (which I’ve added to the wiki)

I was also able to dig through the FAA registry records to see what tail numbers have been registered so far. I've added all that I've found to the wiki.