How will the "P" in GMP work with the datalink clearance at Heathrow? At some other places the clearance is obtained and acknowledged by ACARS (whether or not we are "ready") and the next call is to GMC. I guess you'll want us to read back the clearance to Delivery when we are actually ready and then the planning will occur?
I think GMP could become a really interesting seat to sit in on a snowy day with T5 open and a score of pilots holding datalink clearances, looking at a long taxi with a rapidly expiring holdover time all wanting to know why they can't start NOW as they've already got their clearance!
G W-H