Air passenger traffic around the world reached record highs in May, even in the face of increasing airline costs due to jet fuel prices.

The International Air Transport Association released data recently showing demand, as measured in revenue passenger kilometers, rose 6.1 percent in May over last year — representing an uptick from April’s year-over-year growth of 6.1 percent.

“May was another solid month in terms of demand growth. As had been expected, we saw some moderation, as rising airline costs are reducing the stimulus from lower airfares. In particular, jet fuel prices are expected to be up nearly 26 percent this year compared to 2017. Nevertheless, the record load factor for the month signifies that demand for air connectivity is strong,” Alexandre de Juniac, IATA’s director general and CEO, said in a statement.

International passenger traffic demand was also up 5.8 percent in May. Asia-Pacific airlines saw the highest growth in demand.

“Passenger traffic has continued to trend strongly upwards in seasonally-adjusted terms, buoyed by a combination of robust regional economic growth and increases in the number of route options for travelers,” IATA said of the Asia-Pacific growth.