N139UA is reserved. Post-cancellation hold held by Cancelled/Not Assigned — if it isn't renewed, the FAA releases it on May 9, 2031 (in about 4.9 years).
This tail was recently cancelled. The FAA holds cancelled N-numbers before releasing them back to the public.
Reservations lapse more often than you'd think. Check back around May 9, 2031 — if the holder doesn't renew, it becomes available. See everything scheduled to free up in May 2031.
N139UA has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N139UA that aren't assigned or reserved: