[Symbiote]

1: It's clearly not been as disruptive as you're suggesting. Flights have been diverted to airports within a few hour's journey by bus or train, others have been cancelled, just like would happen with Atlanta.

2: I don't know if they've done it, but the UK can grant entry for a few days to affected passengers. This will be part of a contingency plan.

3: The airport reopened for some flights already.