Omicron's rise has heralded another pandemic-tinged Christmas for billions, with Santa's arrival and longed-for family reunions overshadowed by the prospect of yet more Covid restrictions.
Festive jokes about reindeer having "herd immunity" and millions isolating "Home Alone" may be wearing thin, but the emergence of the ultra-infectious Omicron variant means the pandemic isn't going anywhere.
For a second straight year, surging infections have complicated yuletide plans from Sydney to Seville.
In Bethlehem -- the city Christians believe was Jesus' birthplace -- hoteliers expecting an influx of tourists have been disappointed. After a near-total pandemic lockdown last year, Israel's borders are again closed.
This year, like last, midnight mass in the city on Christmas Eve will be reserved for a small circle of people by invitation only.
In Europe, governments are reimposing misery-inducing safety measures that are draining the fun from Christmas for many.
The Netherlands is back in lockdown while Spain and Italy have made wearing masks compulsory outdoors.
And with the United Kingdom recording a record high number of Covid-19 infections on Thursday, British Prime Minister Boris Johnson suggested getting a vaccine booster shot as a Christmas gift for relatives.
Still, Christmas gatherings will be easier than a year ago in many other places around the world.
Most Australians are allowed to travel interstate over the festive break for the first time in two years, bringing a touch of Christmas sparkle even as case numbers hit record highs.
"We've all witnessed the moving scenes of people at airports after months of separation," Sydney's Catholic Archbishop Anthony Fisher said in his Christmas message.
"In such dark times, Christmas is a ray of light, a sliver of hope."
And Pope Francis is still scheduled to deliver the traditional Christmas Eve midnight mass from St Peter's Basilica.
Millions of Americans are also on the move during the busy travel days before Christmas, even as Covid infections with Omicron surpass the peak of the Delta wave and hospitals run out of space for patients.
However, thousands of them are set to face a grim holiday weekend, with major carrier United cancelling 120 flights because infection numbers had impacted flight crews and other operations.
In one sign of people's darkened mood, one of the most popular shows on Netflix in the run-up to Christmas has been "The Unforgivable", a less-than-festive tale of a murderer released from prison and struggling to win redemption.
Books on identity and slavery topped the New York Times bestsellers and a profanity-laden rant about a bad break-up led the Spotify charts -- beating even Mariah Carey's perennial Christmas hit "All I Want for Christmas Is You".
In Britain, Rage Against The Machine's distortion-laden "Killing In The Name" was voted the country's favourite Christmas Number One of all time.
But angst borne from a seemingly interminable crisis, long testing queues, cancelled flights and close contact notifications will not prevent Santa from doing his rounds.
The hirsute spreader of holiday cheer has reportedly been cleared for travel in Canada's airspace after showing proof of vaccination and a pre-flight negative Covid test, Ottawa's transport minister said.
Santa's flight crew -- including reindeer Rudolph, whose "nose shone red and bright (but) made sure he had no Covid-19 symptoms before taking off" -- have also been given the all clear.
And Australian authorities said they were working round the clock to ensure "Operation Present Drop" goes smoothly.
"Our air traffic controllers will be guiding Santa safely through Australian airspace, using our surveillance technology to track him twice every second to ensure we keep Santa and his reindeer safe, on time and on track to deliver presents," said aviation safety authority Airservices.
"He's cleared to fly at 500ft so he can skim the rooftops and deliver his presents quickly and quietly -- after all, his magical sleigh isn't your average aircraft."
