Winter Storm Blair is causing major disruptions to air travel across the US, with snow and freezing rain hitting the Midwest, Central Plains and moving into the South and Mid-Atlantic regions today. As of Sunday night, an ice storm from the polar vortex caused more than 1,500 flights to be delayed or canceled. Fueled by a surge of moist Gulf air and Arctic cold, Blair is set to bring record-breaking snowfall, ice and severe weather to 15 states. Forecasters are calling for severe thunderstorms and tornadoes in the South, which may cause more power outages.

GET NEW TIPS ON WHAT TO DO IF YOUR FLIGHT IS CANCELLED

Even in death, Jimmy Carter is a unifier. All five living US presidents will gather this week to honor the 39th president, who passed away last weekend at 100. Known for his emphasis on peace and human rights, Carter's six-day funeral began Saturday in his hometown of Plains, Georgia, and will end with Thursday service at the Washington National Cathedral. All five living presidents -- Joe Biden, Donald Trump, Barack Obama, George W. Bush, and Bill Clinton -- plan to attend, highlighting a rare moment of unity in the nation's often divisive political climate.

WHY ATTENDEES SAY MEETING WILL BE 'SLIGHTLY AWKWARD'

Amazon founder Jeff Bezos' company Blue Origin is poised to launch its first orbital rocket, marking a pivotal moment in the commercial space race currently dominated by Elon Musk's SpaceX. Named New Glenn, the rocket is scheduled to lift off from Cape Canaveral Space Force Station in Florida as soon as Wednesday. It will mark Blue Origin's long-awaited entry into the lucrative orbital launch market after years of suborbital flights with its smaller New Shepard rocket, which carries passengers and payloads on brief trips to the edge of space.

HOW BEZOS PLANS TO JOIN THE SPACE RACE LED BY MUSK

Who holds the record for the most cumulative time spent in space?

Friday's answer: The largest known piece of space debris to hit Earth is the Skylab space station, a 77-ton US spacecraft that disintegrated over Western Australia in 1979, scattering debris across the region.