The heavy fog conditions have caused disruption at Ireland West Airport Knock for a second day as families try to return home for Christmas.
One Ryanair flight was diverted twice from the airport so far today, as the national fog warning remains in place.
Flight FR8142 from London Luton was diverted to Belfast International Airport and the same flight was diverted to London Luton.
Aer Lingus flight EI911/ BA2071 landed at the airport at 14:53.
Meanwhile in the departure gates, Ryanair flight FR8143 to London Luton was cancelled.