It's not exactly clear. Trump said he was declassing everything. Could be everything relating to 2016 election, or everything sacred to the DS.
Two reasons. Trans-PAC is a long flight and Alaska gives them a chance to stretch legs and check the aircraft. Secondly, in flight refueling is a tricky and potentially dangerous thing with an aircraft that large. Not sure but I think in flight refueling is built into AF 1 in case of war and the safest place for POTUS is to be airborne.
The expectation fags are making me chuckle today. They must think military operations are subject to the whims of the grunts.
Hurry up and wait bitches