London Stansted Airport has submitted an expansion plan that could dramatically increase its passenger numbers.
Up to 51 million people a year could pass through the Essex terminal if approved, making it the UK's second busiest airport.
There was no plan to build a second runway or exceed its limit of 274,000 annual flights, the owner, Manchester Airports Group, said, but better use would be made of the existing runway and rail and road access would be improved.
"We have an exciting and ambitious vision for London Stansted and how we best serve our region," added managing director Gareth Powell.
The airport has already started work on a £1.1bn expansion approved by the government in October 2024.
It attracted record-breaking numbers of jet-setters in 2024, with 29.3 million people taking flight in the year to September.
