A yellow weather warning for fog, which led to several Belfast flights being cancelled on Thursday, remains in force across Northern Ireland.
Seven early-morning flights, which were due to depart from Belfast City Airport between 06:30 GMT and 08:00 GMT on Thursday, remain cancelled.
One flight to Amsterdam, which had been due to leave the airport at 06:30, is now scheduled to take off at 08:00.
Belfast International Airport appears to be operating as normal.