HONG KONG, Aug 12 (Reuters) - Hong Kong's Airport Authority has cancelled all flights not yet checked in by Monday afternoon, the agency said, as anti-government protesters peacefully demonstrated at the airport for a fourth day.
"Other than departure flights that have completed the check- in process and the arrival flights already heading to Hong Kong, all other flights have been cancelled for the rest of today," the authority said in a statement.
Traffic on roads to the airport was very congested and car park spaces were full, the authority said.
The increasingly violent protests have plunged Chinese-ruled Hong Kong into its most serious crisis in decades and presented a serious challenge to Beijing. (Reporting by Felix Tam, Clare Jim, Twinnie Siu; writing by Farah Master; editing by Darren Schuettler)