China Volcano Flights

Passengers who have tickets to fly from Beijing to Frankfurt wait to get on a bus heading towards a local hotel after their flight was cancelled at the Beijing Airport in Beijing, China, Tuesday, April 20, 2010. An international pilots group warned that ash remains a danger and meteorologists say Iceland's still-erupting volcano isn't ready to rest yet, promising more choked airspace and flight delays to come. (AP Photo/Alexander F. Yuan)