Heathrow's third runway: the crucial battlegrounds

The plan to expand Heathrow still faces hurdles, including environmental impacts and whether the sums add up

Heathrow has long argued it is in effect full, with the number of flights capped on its two runways. Its contention is that only a major hub airport, with connecting flights adding passengers from around Britain, can sustain the long-haul route network that an island nation requires, particularly in regards to trade with emerging markets and the post-Brexit environment. It is a point of view shared by many business leaders and the Department for Transport. Most international airlines want to fly to Heathrow rather than other London airports, and most cargo goes the same way.