The Airports Council International (ACI) said overall passenger traffic at European airports decreased by 13.5% in April 2010 compared with traffic in the same period in 2009.
The ACI attributed the sharp decline in traffic to the closure of nearly 80% of Europe's airspace for several days in April as a result of the Icelandic volcanic eruption.
Overall freight traffic among European airports increased by 14.3%, while aircraft movements decreased by 13% in April, compared with April 2009.
The total figure for passenger traffic for the first four months in 2010 declined by 0.3%, while total cargo traffic rose by 22.0% and aircraft movements dropped by 4.4%.
A few airports - Istanbul Atatürk International Airport, Ankara International Esenboga Airport and Antalya Airport in Turkey – experienced an increase in passenger traffic.
Pulkovo Airport, Domodedovo International Airport and Moscow-Vnukovo Airport in Russia also posted a rise along with Ohrid Airport in Macedonia, Papola Casale Airport in Italy, Ibiza Airport and Bilbao Airport in Spain.