Airports operator BAA yesterday said it handled a record number of passengers last month, despite the impact of the London bombings.
BAA said domestic travel was hardest hit in the wake of the blasts, with many Britons cancelling flights and opting to go by coach or train.
With the Tube and mainline rail network in London paralysed following the explosions on July 7, some passengers were unable to reach the airports to make flights.
Initial advice to office workers to stay indoors until police and emergency services took control of the situation also meant many flights were missed.
This was most visible at Heathrow, where 6.46 million passengers passed through the airport in July - down 0.6 per cent on a year ago.
BAA handled 14.6 million travellers last month and a spokesman said the numbers would only have been " fractionally higher" if the bomb blasts had not taken place.
He said Britons were reluctant to cancel holidays to foreign destinations such as the United States despite the heightened state of alert.
However the drop-off in domestic travel at Heathrow was cushioned by the fact that the airport is running at peak capacity during the summer, with no spare slots for flights.
In addition, the budget travel craze meant its other airports at Gatwick and Stansted continued to show growth compared with a year earlier.
Gatwick handled 3.57 million passengers in July - up 3.3 per cent on the same stage of 2004 - and Stansted saw 6.1 per cent more people use its facilities than last year, totalling 2.18 million.
Across all its airports, BAA said domestic services rose 1.4 per cent in July compared with growth of four per cent in the previous month.
The short-haul charter market proved to be the weakest sector during the month, with 5.5 per cent fewer passenger movements.
European scheduled traffic was up 3.8 per cent and North Atlantic traffic increased by one per cent, while other long-haul routes continued their recent strong trend with growth of 7.5 per cent.
Details emerged less than a week after British Airways said the bombings had not materially affected its business in July, although it was too early to assess the longterm impact.
BAA said Aberdeen enjoyed the fastest growth among its airports in Scotland, which recorded a combined increase in passengers of 5.8 per cent to 2.18 million.
More low-cost airlines flying from Southampton meant its airport there saw 30.8 per cent more travellers than a year ago, at 194,600.
July air transport movements increased 3.9 per cent against the previous year while cargo volumes fell 2.7 per cent.
For the year to the end of March 2006 BAA is forecasting traffic growth of 3.5 per cent at its London airports.