I don't know about AIM programming, but it should be as solid as the tail number's paint. A tail number (registration) can legally have only one i.d.
Of course, I know certain SSR radar operators in southern Nevada area used to play games with airliners, such as having bogus targets approach from four different directions, causing the airliner's TCAS to go nuts. Once discovered, we had some USAF Reserve pilots get the word to them to knock that crap off...
GB