We are booked for 15th-29th September flying from Manchester, and I am very optimistic that the parks/resorts will be open (with social distancing obviously), but pessimistic as to the chances of flying. I hope I am totally wrong obviously as if the US is accepting international visitors (and the UK has opened it's airports) then it means we have succeeded as a society on both sides of the Atlantic in flattening the curve and halting the spread of the virus - the question would for me be whether the world is ready to risk a potential second wave/peak by allowing international flights again.
Fingers crossed.
We're also flying from Manchester just a month earlier and it is a concern whether we will be open to leave the uk or allowed to land in the US. So many moving pieces of the puzzle. Just got to keep hoping really.