Originally Posted by
Discorde
The advantage of 3- and 4- (or more) runway airports is obvious, preferably with different directional orientations to facilitate less hazard crosswind operations and - when the wind is light - variable direction runway usage to selectively alleviate noise pollution in different locations near the airport.
Not obvious to authority, as virtually every UK airport with different direction runways has had its cross runways closed over the years - Heathrow, Prestwick, Edinburgh, Birmingham etc. I can only think of Belfast Aldergrove as remaining.