Looks like Hong Kong only supports 2 letters for registration. That makes coming up with reasonable registration numbers extremely challenging.
Since the registration numbers of aircraft are only visible to the player himself, could we get rid of the international registration schemes (or have them only as automatic (secondary) and let player pick his own aircraft name (nickname).
Or, as an alternative, could we have, in setting, a switch what the primary sorting mechanism will be in scheduling, either registration or nickname. Then, we could just use nicknames, if we chose to...