Registration callsigns - really basic question!
Something that has long bothered me, but I have always thought too stupid to raise....
The books say that the pilot can shorten G-ABCD to G-CD only once ATC has done so, but my experience is that ATC never take the initiative to do this, it is always the pilot, and many units use the full 5 letters even when the pilot has shortened it. This last point being particularly true of LATCC.
So, what's the position, theoretical and practical?
Will