Hi all we did have to clear Immigration and Customs as the check in counter said that the flight was a bit tight with loadings.
The first check in agent was not nice at all and told us to come back after 17:30, and when we did we picked out the agent who looked like a Sunday school teacher and we were checked in on the spot, with the good seat and not having to go to the gate for the regrade.
After sitting upstairs in the restaurant area drinking water, yes water (have to make a good impression) for 5 hours we were hanging out for a beer and a shop.
Thanks again.