Shannon vs Shanwick
What is the protocol to receive a new oceanic entry clearance when too early at the entry point?
We were airborne EINN and going to be 10 minutes early at the entry point, so we told Shannon Center. They said they would send the revised estimate to Shanwick. About 10 minutes later we asked Shannon if we were cleared to enter the track at the revised estimate, their response being "we have revised the estimate with Shanwick." So, are we cleared in, or have they only revised the estimate? After a few more radio calls we cleared it up. What were we suppose to have done? (Should we have called clearance delivery in the air? Does that go right to the authority?)