KUNMING, Dec. 29 -- Thousands of passengers are stranded at an airport in southwest China's Yunnan Province Sunday as heavy fog disrupts air services.

A total of 106 flights have been canceled and hundreds more are delayed in the airport in Kunming, capital of Yunnan Province, operator of the airport said.

The air services would be gradually resumed at noon when the fog was forecast to clear slowly, it said.

The airport operator and airlines use loudspeakers and text messages to notify passengers of the flight schedules and also offer free meals for stranded ones.

Heavy fog has affected flights into and out of the airport for three straight days.