BOS

Logan is compact by hub standards, which means terminal walks are short and connections are pleasant, but it also means there's very little buffer capacity when things go wrong. A single nor'easter can strand traffic for a full day because there's nowhere to spill overflow flights. Winter travel from Boston has genuine weather risk in a way that Atlanta or Dallas simply doesn't.

Terminal B (JetBlue's main terminal) and Terminal E (international) are the busiest and most likely to have TSA waits worth planning around. Terminal A (Delta) and Terminal C (mixed carriers including United and Alaska) are noticeably calmer even at peak hours. If your itinerary lets you choose between JetBlue and a different domestic carrier, the non-JetBlue terminals are the easier security experience.

Logan has a strong regional-airline presence (Cape Air, JetBlue Connect, etc.) that adds a wave of small-aircraft departures nobody else has. These flights don't produce big TSA crowds, but they do use up gates aggressively — so if you're on a mainline flight, expect gate assignments to be later and more variable than at other hubs.

The Silver Line bus from South Station is criminally under-used. It's the only major US airport where the transit connection is a bus (not a train), but it runs in a bus-only lane through the Ted Williams Tunnel — so it's actually faster than a taxi during Boston rush hour, and it's free from the airport back to the city.