Air freight traffic, a closely watched indicator of economic health, fell 2.2 percent in October - the 17th consecutive monthly decline - ACI said in its latest airport traffic report.
"There is no escaping the deepening impact of the European sovereign debt crisis on the real economy," ACI Europe Director General Olivier Jankovec said in a statement.
Air freight traffic was down 2.9 percent overall in the year to October compared with the same period last year.
The figures, which include domestic flights by low-cost airlines such as easyJet and Ryanair, showed a 0.15 percent decline in EU passenger traffic due to disruption caused by Hurricane Sandy, which mostly affected large European airports with the highest concentration of transatlantic routes.
Despite the fall in passenger numbers within the 27-nation European Union, European passenger traffic as a whole increased by 0.5 percent in October when non-EU airports were included, ACI Europe said.
Airports in countries such as Russia and Turkey continue to enjoy double-digit growth in passenger volumes, ACI Europe said, with a 19 percent year-on-year increase in numbers at Istanbul's Ataturk Airport.
The International Air Transport Association (IATA) published figures last month showing a 2.6 percent rise in passenger traffic for European carriers in October. IATA's data only covers international flights. (Reuters)