UK chancellor argues third Heathrow runway would boost economic expansion

Approval and funding commitment for a third runway would likely support construction and aerospace suppliers, while potentially easing long-term capacity constraints that have weighed on UK aviation and logistics sectors.

Continued political ambiguity without formal approval or rejection would leave the project in planning limbo, keeping uncertainty priced into aviation, real estate, and infrastructure-linked equities without triggering material repricing.

Formal rejection or indefinite shelving of the expansion would signal policy retreat from infrastructure-led growth, potentially dampening sentiment toward UK-listed construction and aviation stocks and reinforcing concerns about long-term productivity constraints.