Originally Posted by
Dubh
If i remember correctly, you can end up with Speedbird 712 (Zurich) and Shamrock 712 (Cork), or maybe numbers in that series in London airspace at the same time.
Heathrow Tower?
Absolutely. Differing airlines can and do have the same flight number while flying through the same sector of air traffic control. IE. Speedbird 566 could be in the same vicinity as Swiss 566.(numbers used are random choice)