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Planes at NI's three airports have been grounded for a second day as volcanic ash from Iceland drifts across Europe.At 0830 BST, the air traffic control body Nats extended its unprecedented restrictions on UK airspace until at least 0100 BST on Saturday.
However, a small number of services will be permitted into and out of Northern Ireland and western Scotland.
Some flights to the Isle of Man are also running, but passengers should check with their airlines in all cases.
Most flights will not take off from the International, George Best Belfast City and City of Derry airports until at least 1900 BST on Friday.
In the Republic, the Irish Aviation Authority said it was lifting restrictions on flights to and from airports at Cork and Shannon and some of the regional airports.
However, the restrictions will remain in force at Dublin airport until, at least 1100 BST on Friday.
Aer Lingus said all UK and European flights scheduled to depart Dublin, Cork, Shannon, Belfast, London Gatwick and Heathrow up to 1300 BST are cancelled.
Flights from Ireland to the US are expected to operate with delays, with the exception of the Shannon to New York service, which has been cancelled.
So far an estimated 600,000 passengers have been affected in the UK.
European air traffic control organisation Eurocontrol has said it believes flights could be disrupted into the weekend.
Denmark, Norway, Sweden, Finland, Belgium and the Netherlands also closed their airspaces on Thursday and airports were shut in northern France and Germany
At the seaports P&O, Stena and Norfolkline sailings are operating as timetabled today.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.