More than 100 domestic flights in Japan were grounded on Sunday due to heavy snow in the northern and western parts of the country, Japan's two biggest airlines said.
ANA Holdings had halted 79 flights as of 4:00 pm (0700 GMT), affecting about 5,100 passengers, said Hiroaki Hayakawa, an operations director for the airline.
Japan Airlines Co had cancelled 49 flights as of 4:00 pm (0700 GMT), affecting 2,460 passengers, a representative with the airline's operations division said.
Worldwide, thousands of flights have been cancelled over the Christmas weekend because of the rapid spread of the new Omicron coronavirus variant.
Japan, which tightened border controls to counter the threat from Omicron, has reported only about a dozen cases of community spread of the new variant and 231 total Omicron infections, including overseas arrivals, according to the health ministry.
The US House of Representatives rejected an effort on Thursday to stop President Donald Trump's air war on Iran and require that any hostilities against Iran be authorized by Congress, backing the Republican president's military campaign.
Foreign ministers from the Gulf Cooperation Council (GCC) and the European Union have strongly condemned the Iranian attacks targeting GCC states, calling them a direct threat to regional and global security.
US President Donald Trump claimed the right to join Iran in deciding its next leader as the war escalated, with US and Israeli jets hitting areas across the country and Gulf cities coming under renewed attack.
British Prime Minister Keir Starmer said on Thursday that four additional Typhoon fighter jets would be sent to Qatar amid the ongoing regional developments, insisting that the UK has the right plan for defence.