Traveller numbers passing through Heathrow Airport have reached a record June figure of 6.6 million customers.
This represents a 1.1% rise on the same month in 2014, the airport reported.
Last month’s figures also reveal the best-ever flight numbers for June, at 40,600, many of them ferrying passengers to holidays abroad.
John Holland-Kaye, chief executive of the airport, said the latest statistics give added ammunition to supporters of another runway at Heathrow.
He said ministers should now press on with agreeing to a recommendation by the Airports Commission for a third runway there.
Heathrow’s passenger-to-aircraft ratio in June was marginally up on the same month in 2014, at 165.
Cargo numbers have risen by 4.3% during the last 12 months, fuelled by rises of 44% and nearly 20% to Mexico and Turkey respectively.
Mr Holland-Kaye said that the Airports Commission’s officials effectively finished the argument over where Britain’s next airport runway should be sited, by backing Heathrow’s expansion scheme.
He called the Government’s choice “binary”.
Mr Holland-Kaye said it can either approve the expansion of the West London site and create growth, jobs and money-spinning export routes, or do nothing.
The latter option would mean the UK retreating as a country, he added.
Whether you’re off to shop in Paris or soak the sun up in Mexico get your Travel Money with ICE. Click here for our excellent exchange rates.