A third runway at London Heathrow Airport is an idea that’s been kicking around since the 1980s. It remains elusive, having divided politicians in the UK for decades.

London Heathrow airport's operator believes a 3,500m (11,500ft) third runway will provide the greatest benefit to the hub, but it is still analysing whether a slightly shorter one of 3,100m will suffice.

After decades of debate, Heathrow Airport has submitted its detailed expansion proposal to the government, aiming to deliver a fully operational third runway by