How can I find a deregistered airplane? I'm trying to find a 1959 C172 tail number N7393T.
It was my grandfather's and the last registered record of it was near Glendale AZ.  It was deregistered in 2015 and I found out that since it cannot be reregistered for 5 years it may have a new tail number. Any tips on tracking and finding this plane would be helpful.
Sorry to be the bearer of bad news. But, you have already asked this question on www.airport-data.com. A quick search in the FAA search database with the tail number or serial number (which can be found using the tail number) shows that it has not legally flown in the US in almost a decade. So, it is either sitting somewhere as a ramp queen, registered overseas, or not in existence any longer.
Try contacting the last person to register it. Otherwise, it would be like trying to find a salvaged car after it has been junked. It will only pop up if it is reregistered. However, you can pay a private firm like a law firm to research the aircraft’s certificate of title (or simply title). It would be like searching a deed.