The airport trade body says this is on par with the average 12-month growth trend of 4.7%, and international travel continued to maintain momentum by increasing 5%, while domestic passenger markets rose 4.2%.
Most regions posted strong gains in passenger traffic, with the exception of Africa, which was almost flat for the month of June, compared to 2013.
Europe posted the highest growth rate of 6.1% since traveller numbers were significantly depressed in 2013 due to the Euro area crisis.
The top 30 busiest airports in Europe all posted gains in traveller traffic, and Asia-Pacific experienced more subdued growth in June with mixed results across many airports in the region.
Tokyo-Haneda posted strong gains of 7.6%, Beijing Capital was almost flat with respect to the previous year, and Jakarta International, Indonesia’s busiest airport, also saw a decline in passenger traffic of 6.9%.
ACI World, says several airlines are pulling back on services in an effort to restructure operations in the region, while the Middle East was also well below the 12-month growth trend in June with growth of 4.4%.
ACI World’s economics director, Rafael Echevarne, explains: “As we pass the year’s mid-point and look back over the last six months, it is impressive to see the continued resilience in air transport demand.
“Surprisingly, the cyclical slowdowns in emerging markets and the turbulent recoveries in advanced economies have left the aviation sector largely unfettered in the first half of 2014 with year-to-date growth rates of 4.8% in passenger traffic and 3.7% in freight volumes.
“Nevertheless, the fragile state of the world economy, the recent geopolitical risks in Eastern Europe and the Middle East and the Ebola outbreak in Western Africa represent significant downside risks for aviation.
“Thus, while there is an ongoing sense of optimism for the industry, one should be cognizant of these pitfalls.”
ACI World also reports that air freight markets achieved moderate growth of 2.2% in June, attributed to the recovery in world trade coupled with an improvement in domestic demand in advanced economies helping bolster markets over the last three quarters.
Echevarne adds on air freight, that the industry remains relatively sluggish and has barely surpassed the volumes that existed in the pre-Great Recession era, while suppliers of air freight capacity need to 'rethink their business model in order to remain competitive'.