Aircraft movements at Hong Kong International Airport (HKIA) are still on the decline, with the airport handling nearly 22,000 fewer movements in 2009 than in 2008. However, there is concern that, as the economic recovery takes hold, airport congestion at peak times could lead to increasing levels of delays and add flight times into Hong Kong. The worry is that air traffic corridors and airspace available for civil aviation in the Pearl River Delta (PRD) region are insufficient to handle growth and that any more delays and diversions could eat into airlines’ prospects for recovery, as growth returns over 2010. As a major regional hub HKIA now serves a significant volume of transfer/transit traffic and a growing number of small aircraft, operating through PRD airspace into Mainland China.