The same concerns have seen flights cancelled or rescheduled at Chiang Rai's Mae Fah Luang Airport after 8pm on November 25.
Chiang Mai Airport director Group Captain Wisoot Chantana said yesterday the province had informed airlines about a regulation issued recently that prohibits people from releasing floating lanterns in Muang, Saraphi, Hang Dong, Mae Rim and San Sai districts, except for 10am to noon and after 9pm on November 25.
He said airport officials were instructed to check and clear runways 10 times a day between November 24-26.
As of Monday, airlines had cancelled 62 flights covering 9,300 passengers during the period, he said.