Flights leaving Northern Ireland are returning to normal after the delays and cancellations of the last two days.
However, dense fog is continuing to cause problems for Christmas holiday travellers at Heathrow and other UK airports.
Hundreds of domestic flights and some international flights are grounded.
British Airways said it expected its services at Heathrow, Gatwick and London City airports to be affected well into the weekend.
Heathrow airport was worst affected on Thursday, but there were also problems at other airports.
However, the managers of George Best Belfast City Airport and City of Derry Airport said backlogs had gradually been cleared.
However, dense fog is continuing to cause problems for Christmas holiday travellers at Heathrow and other UK airports.
Hundreds of domestic flights and some international flights are grounded.
British Airways said it expected its services at Heathrow, Gatwick and London City airports to be affected well into the weekend.
Heathrow airport was worst affected on Thursday, but there were also problems at other airports.
However, the managers of George Best Belfast City Airport and City of Derry Airport said backlogs had gradually been cleared.
Good news for my daughter (I hope). YaY!
The Met Office has advised that the dense fog is set to continue over coming days. As a result passengers intending to fly in the next few days are likely to be heavily affected and we therefore strongly advise you to check with your airline before leaving for the airport.
Aberdeen flights to Heathrow remain the worst affected. .
... but bad news for Murray Walker!!
News - Air alert: Aberdeen and Inverness
Formula One racing commentator Murray Walker faced problems at Aberdeen Airport as he tried to fly to Heathrow. She said: "I hadn't known anything about it until we arrived at the airport." 10 Aug 2006
