August passenger numbers dropped 1.9% at London Heathrow to 6.5 million, with BAA bosses blaming the ‘Olympics effect’.
Passenger numbers across BAA’s five UK airports – Heathrow, Stansted, Glasgow, Aberdeen and Southampton – dropped 2% to 9.5 million.
BAA said it believed UK passengers were staying at home during London 2012, as well as non-Olympic visitors from overseas choosing to defer their journeys.
CEO, Colin Matthews, said: “We are proud of Heathrow's performance during London 2012, and warmly thank the volunteers, our own staff and the many other organisations who planned and delivered a warm and efficient welcome to Great Britain.
“We intend to combine the best of the Games experience with Heathrow's on-going investment programme to steadily improve the airport for our passengers and airlines.”
At Heathrow, European scheduled traffic declined across the board, with only Denmark (1.2%) and Norway (4%) seeing an increase.
North Atlantic traffic continued to perform well, up 3% on last August, while Brazil and China increased 9.5% and 4.1%. India saw a 8.7% decrease.
Passenger traffic at Heathrow across July and August was lower than BAA had predicted, with the shortfall not expected to be recovered later in the year.
At Stansted passenger numbers were down 5.2% compared with August 2011, while traffic through Southampton declined 6.4%.
Traffic through Aberdeen was up 9.2% and at Glasgow up 3.1%, resulting in a total increase at the Scottish airports of 4.9%.
BAA did, however, report “encouraging signs” in the cargo business , with figures up 2.6% across the group, and a massive 13.9% at Stansted.
Written by @SteveThompsonAM