TheRealCanadian
Volunteer Moderator
i believe the restriction on changing jobs only applies to the 'sponsoring' employer. I could be wrong, but thats what I remember reading in one of the many msgs which had cut and pasted some stuff from uscis site about citizenship questions. Plus AC-21 does not stipulate that I will continue working for Company B fater green card.
What AC21 allows the alien to do is port the Green Card process to a different employer or a similar job, but that's about it. The underlying expectation is that the job is permanent, the alien intends to work there indefinitely and everything else in the GC petition remains the same.
It's why you cannot use AC21 to port to a job with an explicit end date, or less than a full-time job.