great - thanks for the info - seem to be quite a few 24-xxxx 2nd hand aircraft advertised, so it seems if I just stick to only looking at factory built (and fully registered) this should be all I need to do then, i.e. to know I could later (after getting RPL too) fly through class-c/class-d. Would want to be able to land/takeoff from class-D ultimately so I assume there's no difference here between an aircraft certified to enter/operating in say class-d, as opposed to being allowed to land/take off from a towered airport in class-d?