A record June at Heathrow helped BAA to enjoy increased passenger numbers at its UK airports last month.
The company's six airports handled a total of 9.9 million passengers - up 4.4% on the June 2010 total.
Heathrow handled 6.1 million passengers last month, a 6.3% rise on June 2010 and the west London airport's busiest-ever June.
There was a big rise in the number of people flying to Brazil from Heathrow, while US destinations also did well.
Numbers at BAA's other major London airport, Stansted, fell 3.3% last month and the Southampton passenger total was 0.8% down, but BAA's three Scottish airports all saw rises, with Aberdeen up 10.1%, Edinburgh up 7.6% and Glasgow up 2.6%.
BAA chief executive Colin Matthews said: "Heathrow's position as the UK's only hub airport enables it to benefit from growth in long-haul routes and emerging economies.
"June's passenger figures are an early indication of a busy summer, and we will focus on delivering the best possible service standards at our most popular time of year."
There was a 5.2% rise in passenger numbers last month at Gatwick, which was formerly a BAA airport but is now run by US-based investment fund Global Infrastructure Partners.
The West Sussex airport handled 3.20 million passengers in June 2011, an increase driven by a 13.9% rise in European scheduled traffic.