I am always fascinated by New York’s JFK International Airport. It’s one of the rare examples in the US — the only example? — that has multiple private operators running different terminals. And in the past, that has made for some very strange bedfellows. But the airport’s $19 billion plan to remake itself is finally showing how most airline locations are starting to fall into place. The recent addition of United to Terminal 6 as part of its JetBlue deal just cements it even further.