They took off from many different places so you'd have to somehow know that ~150 aircraft were taking off. If you happen to just see one spot, you'd likely just assume it was another bombing of a boat or a dock.
Or… someone seeing a bunch of commercial flights over the Caribbean getting cancelled. Could be anyone from airline ops to frustrated travelers stranded in Boston.
I guess... but I still think first thought would be just some more bombing. It's a big step to go from bombing boats, a dock, arresting and extraditing a foreign leader in the middle of the night.
