GB that's interesting to know if its a regular occurance to have two flights with the same number in the air at the same time. Internationals seem to be more prone to this scenario but get around it extremely simply but the addition of a suffix letter to the flight number callsign, eg "D" for delay, "P" positioning (?), etc... surely that couldn't be too hard for dometic ops to arrange? Mind you when we asked for them to drop the "VH" from the callsign in flight plans we got the "too hard" answer.