Thanks very much for your assistance that day, it was appreciated. the delta in question had come originally from that copenhagen frequency, and we suspect in trying to contact shanwick for his oceanic clearance that he used his no.1 box which was on our frequency and then once he had his clearance went back to monitoring the no.2 box which was still on copenhagen's freq but obviously out of range.
There are many stages we go through including those you have mentioned. we will always talk to shanwick for traffic that is transatlantic bound , incase the situation described occurs. we also will talk to the airline ops who will be able to send an acars text message , and use the oceanic sel call as well as utilising any company aircraft to try to pass a message on a company frequency
once again, thanks very much
