<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by redburgundy:
So, is this 8193 the callsign that would be used on the domestic segment of a flight that uses the same flight number but different equipment on an international segment?</font>
No - the nose number will have no relation to the radio callsign. The radio callsign is usually a variation of the original flight number (but certainly not always), depending on the range of numbers available.