Megan Scheffers waited until July to celebrate Christmas with her kids after the COVID-19 pandemic kept them apart last winter, but she says decorating candy log cabins just wasn’t the same in the dead of summer. She was hoping to make up for missed traditions this year as two of her three children booked mid-December tickets to fly to Nova Scotia from the Netherlands, where they live with their father. But as the Omicron variant of the novel coronavirus threatens to upend the holiday season, Scheffers said she’s worried her 12-year-old and nine-year-old may not make it to Halifax to...