I think this post belongs in this forum because it has to do with with ATC communication. I just brought home my "new" Ercoupe. N99825. It rolls off the tongue pretty well: niner niner eight two five. But, I also have the tail number reserved from a 172 I owned nearly 40 years ago. For some reason it was deregistered. I saw that it was available so I paid the ten bucks to reserve it and am considering registering the Ercoupe to N739RC. Seven three niner Romeo Charlie doesn't roll off the tongue quite so easily BUT I find it much easier to pick up when ATC is calling me, like in a Flight Following situation. The "Romeo Charlie" kind of jumps out at me more than the string of numbers. Does that make sense? I wouldn't change the tail number just to change it, but I have a sentimental attachment to that reserved number. The fact that it will be more easily recognized on a busy frequency is a big selling point.