It's really a toss-up. Dallas is the second-closest, obviously. London might give you a westward route across Eurasia instead of eastward through the US. I thin

It's really a toss-up. Dallas is the second-closest, obviously. London might give you a westward route across Eurasia instead of eastward through the US. I think I'd probably do Newark or London, avoiding Dallas in case most of North America falls into the ocean, and avoiding Atlanta in case something changes with the port blocking.