B.borg, in part its due to the pilots setting Flight ID on the transponder controller correctly. Looks like Bond (as do Bristow) are setting their callsign / flight number, whereas CHC are just leaving the registration, which is incorrect I think.
Currently I don't think Aberdeen ATC have Mode S desks yet, but when they do these things will get picked up.
Last edited by HeliComparator; 30th Aug 2013 at 08:56.