The British Airports Authority (BAA) said that passenger traffic at its six airports dropped in May due to the continued volcanic ash disruption and the British Airways strike.
BAA's UK airports experienced a 4.5% drop in traffic to 8.6 million in May, compared with the same period in 2009.
Scotland's Glasgow posted the biggest drop with 13.7%, followed by Edinburgh with 11.6%, Heathrow 3.1%, Stansted 1.5%, Southampton 2.6% and Aberdeen 9.9% .
Cargo volume declined by 88.3% at Southampton, while it rose by 36.1% at Heathrow, 30.2% at Glasgow, 31.4% at Edinburgh, 7.8% at Aberdeen and 18.2% at Stansted.
Air transport movements dropped by 4.8% for BAA's UK airports.
In the first five months in 2010, BAA's traffic declined by 6.5%, while cargo posted a growth of 21.2%.