The expansion of London's Heathrow Airport may be halted after Andy Burnham indicated he could block the project's progress. The shift in support threatens to derail the addition of new airfield capacity at one of the region's busiest aviation hubs.

The plan for a third runway had been approved by Burnham's predecessor, Keir Starmer, but the project currently faces a 4 year delay. This timeline slip combined with the current lack of executive backing increases uncertainty over the airport's long-term growth strategy.