NEW YORK,  (Reuters) – Commercial airlines around the world canceled more than 4,000 flights over the Christmas weekend, as a mounting wave of COVID-19 infections driven by the Omicron variant created greater uncertainty and misery for holiday travelers. Airline carriers globally scrapped at least 2,314 flights today, which fell on Christmas Eve and is typically a heavy day for air travel, according to a running tally on the flight-tracking website FlightAware.com. The website showed that another 1,404 Christmas Day flights were called off worldwide, along with 340 more that had been scheduled for Sunday. Commercial air traffic within the United