London Heathrow Airport has proposed a four-tier traffic-light system for the UK that builds on the country’s travel corridors policy to control international travel as the British government looks to relax its borders.

Environmental campaign groups Transport & Environment (T&E) and Carbon Market Watch (CMW) claim to have compiled European airlines’ emissions fully for the first time after obtaining government data for pollution on flights entering and exiting the region.

Norwegian Air Shuttle’s proposed restructuring cleared a key hurdle March 26 as an Irish High Court judge approved the airline’s scheme to exit the examinership process.