The issue of 'crossed' flight ID's has been noted in Auckland, New Zealand on many occasions as well. It seems to occur when the hex code of 2 different aircraft are similar (i.e. only a few digits apart). Unlike the above replies - it is most certainly not the aircraft using the wrong hex code. According to a local aircraft engineer, the hex code is set in the avionics bay of an airliner and cannot be changed by the crew. It does appear to be a problem with the software where the flight ID is transposed to the wrong aircraft. I am using version 3.01B and am hoping it will be resolved in 3.02.