The ten leading Middle East hubs are investing some USD48 billion in new/expanded airport projects over the next 30 years, which will provide capacity for an additional 320 million passengers p/a. This will take the leading hubs' total capacity to just over 460 million passengers p/a. But will it be enough? Long term growth forecasts suggest the Middle East region as a whole will need capacity for 600-700 million seats p/a within 20 years, while project delays and cost-over runs could also create a capacity crunch in the Middle East. This could threaten governments' national aviation and tourism development programmes and undermine the high quality and efficient product offerings of the region's airlines.