They were all N number registrations, which cost$5 each. They all expire on 4/28/18 since no aircraft have been assigned to them.
I thought they disposed of both 747's but one seemed to remain registered, though it shows having been canceled on 3/18/18 and retained as an unassigned N number good through 3/16/23. My guess is that the plane was scrapped, and now they hold the N number for 5 more years in case they want to re-use it.
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