Depends on a couple things as to how many hoops. The reason for deregistration and if the aircraft chain of ownership is complete. Regardless, it will require a new N number for the aircraft at this point.
LOLIf an aircraft has been out of registration and is showing it has been de-registered, what is one looking at to get things up to snuff with the FAA. Is it just a matter of registering it, or are their some hoops that need to jumped through?
Asking for a friend
Once a registration expires there is a 90 day(?) window to either finish the renew or reserve that N number. Once the 90 days is up the number is cancelled and is unavailable for use or reservation for 5 years. In my experience, if it's showing de-registered on the online listing the 90 days is usually over. I've only been able to correct one registration that went past the 90 days but it had a renewal app and was still a battle. For some reason I can't get the FAA reference links to load on this. Look to the Registration Renewal page for the reference.