By Jonathan Davies
Heathrow and Gatwick airports have both reported record passenger numbers for March.
Gatwick said three million passengers had used the airport, up 9.2% on March 2014. And Heathrow reported a record 5.95 million passengers, up 3.4%.
It comes when the outcome of the Airports Commission is eagerly anticipated. The Commission is considering bids from both airports to be the preferred location for a new runway in the south easy by 2030.
The three options are a new runway at Heathrow, extending an existing runway at Heathrow and a new runway at Gatwick.
The Commission is expected to release the findings of its report after the general election.
Gatwick believes it will serve 40 million passengers in 2016, more than a decade before the Department for Transport had predicted. The airport saw a 7.4% rise in long-haul flights and Dubai was the destination with the biggest passenger number rise at 14.7%.
Mexico was the destination of choice for Heathrow flyers in March. Passenger numbers to the country were up 26.5%. And there was a 20.2% rise in passengers flying to China.
Gatwick chief executive Stuart Wingate told BBC Radio 4's Today programme: "Already we find ourselves as the world's busiest single runway airport by some margin.
"Gatwick is approaching being full and Heathrow is full," Mr Wingate said.
He added: "We need to choose a runway solution that is deliverable. Gatwick is the only option that is deliverable."