When it comes to air travel in and out of the United Kingdom, the country’s aviation ecosystem is very much built around London. The British capital city is served by six different airports, with the two busiest hubs among this list also being the two busiest in the nation as a whole. WhileLondon Heathrow Airport (LHR) has consistently topped the rankings in this front, second-placedGatwick (LGW) provides useful extra capacity.