If you are a pilot of any livery please change your callsign before you begin your flight to that airline or livery as it difficult for air traffic controllers to recongize who you are. It also clogs up the voice of the ATC when your call sign is NTJDI35 because the ATC voice has to actually say “november tango juliett delta thirty five” which takes a lot longer. A great callsign for example could be, American 253 or United 230 Heavy because the ATC voice only has to say the word and then the ID. It also just looks more professional, but if you are flying in a private livery then I guess than could be an exception to have NDTDKDSGE or something like that as your callsign. But overall, it makes the controllers life easier as it can identify you easier. Thanks!