A boost in pre-Easter traffic helped push passenger numbers at BAA airports up by 4% to 8.6 million passengers in March.
Heathrow handled 5.7 million passengers, a rise of 6.9% on March 2011.
The increase means that the London airport saw more than 70 million passengers over a 12 month period for the first time. It passed the 60 million mark in 1998.
But a drop in domestic flights led to numbers at Stansted, Edinburgh and Southampton dropping by 4.7%, 2.8% and 1.7% respectively.
Glasgow recorded a 4.6% increase while Aberdeen achieved a double-digit increase of 10.2% which reflected a rise in domestic oil-related traffic.
North Atlantic traffic was up 13.6% with other long-haul traffic up 5.2%, BAA said today. The group's biggest market, European scheduled traffic, was up 3.2%.
European charter traffic had strong results across individual airports due to a good ski season in Europe.
Traffic from Heathrow to the BRIC countries also saw growth, with an increase of 62.3% in traffic to and from Brazil.
BAA chief executive Colin Matthews said: "Reaching 70m passengers at Heathrow is a major milestone, demonstrating the resilience of the airport in an otherwise challenging economic environment.
“Increases in load factors drove this; however Heathrow continues to operate at 99.2% capacity - placing constraints on airlines' ability to introduce new flights to the emerging economies which are so vital to UK economic growth."
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