Snow, ice and plunging temperatures in northern Europe have prolonged the Christmas traveler chaos.
Road, rail and air travel was affected, while snow and ice grounded the vast majority of flights in and out of Britain on Sunday, with Heathrow the worst-affected airport.
Paris' Roissy Charles de Gaulle airport is due to cancel 30 percent of flights Monday. Frankfurt airport in Germany has called off 325 flights out of a scheduled 1,300 to 1,400, according to officials, largely due to flight disruptions at other airports.
BA warned that Heathrow would be operating as "significantly reduced capacity for several days" —threatening to leave more than 100,000 Britons stranded overseas for Christmas.
Jean MacKenzie, GlobalPost's Kabul correspondent, was caught up in the chaos. She wrote: "I am trying to make my way home, but am stuck in London [now for the third day].
"I am running around trying to buy shampoo, etc. "They have no idea where the luggage is] ... There is about two inches of snow on the ground... really ...and the whole airport was shut. It is scandalous.
"I will NEVER fly through London in the winter again. I'm trying to get to Frankfurt, and out that way. At least Lufthansa may help rebook if the flight is cancelled. BA just said 'you're on your own.' "
Forecasters see no sign of a thaw. Temperatures hit a record low in Northern Ireland overnight, the Met Office said, with temperatures of 0 degrees (-18 degrees Celsius), recorded in Castlederg, County Tyrone.
Below-normal temperatures are expected to continue in northern Europe for part of this week. The BBC writes about how airports keep going in poor weather.