<h1>National carrier cancels four round-trip flights after airport closure; one plane returned on final approach due to smoke observed</h1> A national carrier cancelled four round-trip flights on the capital-Kathmandu route after the Kathmandu airport was temporarily closed amid mass anti-government protests; one aircraft returned to the origin on final approach after smoke was observed at the airport. Two other carriers also suspended services between the same cities. The carrier noted it operates six daily flights on the route and is monitoring the situation. The disruptions coincided with large protests in Kathmandu and the resignation of the country's prime minister.