If N194AT was only allowed the ferry-flight out of the US with the N194AT registration number, surely it is now flying illegal.
It is clear on CS-TMX's picture above that it is still carrying the N number. Rumour, although much against general opinion, was last that the machine would be registerd in Nigeria to fly this Hajj.
How is it possible then that an aircraft that can almost certainly be registered nowehere else and allegedly direly in need of an outstanding D-Check be flying commercially on the N register and the USA authorities be doing nothing about it?