The Busiest Hub in the World for Passenger Aircraft

The busiest hub in the world for passenger aircraft is atlanta, georgia. I wouldn't have guessed that in a million years. Have you got any one that is frankfort? Another one, o, i think frankfort was on the list, although i can't remember where,. It is a hub, isn't it? Frankfort's a hub. Would one of them be newark? No, but you're in the right country. Am chicago close? But no, cigar. Not chChicago. The a f k, no. And you might be surprised to know i was that madrid and london are not even in the top 50.