The parent company of Heathrow and Stansted saw improved revenues and profits in the first nine months of the year despite a marginal decline in passenger numbers.

The London Olympics hit passenger numbers at Heathrow airport in July and August.

Combined passenger numbers at the two airports declined by 0.5% to 66.4 million with moderate 0.6% growth at Heathrow more than offset by a 4.6% drop at Stansted.

The former BAA, now know as Heathrow Airport Holdings, saw revenue rise by 8.2% in the period to £1.8 billion, with adjusted EBITDA up by 9.6% to £922.9 million.

This led to a pre-tax profit of £111.8 million against a loss of £147.3 million for the same time last year.

The company said: ”Heathrow’s traffic was impacted in July and August by over 400,000 passengers compared to the same period of 2011 by the London Olympics, which resulted in UK based travellers staying in the country to enjoy the games and non-UK travellers avoiding travelling to the UK due to concerns over disruption caused by the games.

“However, in September traffic trends normalised with an all-time record for that month recorded.”

The company is on course to invest more than £1 billion by the end of the year with the next major milestone being the opening of the new Terminal 2 at Heathrow in 2014, according to chief executive Colin Matthews.

He said: “Heathrow continues to report a strong operating and financial performance.

“It received its highest ever passenger satisfaction scores during a period which included the London 2012 Olympic and Paralympic Games.

“Our large and sustained capital investment programme is creating jobs throughout the UK and improving passengers’ experience of Heathrow.”

No further update on the sale of Stansted was given with the figures issued this morning.