Eight of the top 10 busiest airports in the world in 2021 were in the US, data published by ACI World has found, with Atlanta Hartsfield-Jackson retaking top spot.
Warm weather leisure routes launching this winter include the resumption of Vancouver-Miami flights, last operated by the carrier almost two decades ago.
A total of 13 routes are being launched from the secondary airports in Chicago and Houston by Frontier, most of which are served by rival Southwest Airlines.