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Some flights have been arriving and taking off from Belfast International Airport after restrictions on UK airspace were eased.The first set of stranded NI holidaymakers arrived back from Lanzarote on a flight into Belfast late on Tuesday.
Flights also began to take off from the airport early on Wednesday.
George Best Belfast City Airport said it would not resume operations until it reviewed the situation on Wednesday.
An estimated 120,000 passengers have been affected by the closure of Northern Ireland airspace.
The Irish Aviation Authority said full services may take up to three days to recover from the disruption of the past six days, due to a cloud of ash from an Icelandic volcano.
It is expected there will be limited flight operations from Dublin airport on Wednesday and Shannon airport has confirmed it will be open on Wednesday and Thursday.
The UK's Civil Aviation Authority announced new guidelines on Tuesday evening saying there would be a gradual reintroduction of flights in UK airspace from 2200 BST.
A CAA spokeswoman said some no-fly-zones with a higher density of volcanic ash would remain. She said the decision had been taken after consultation with the Irish aviation authorities.
Transport minister Lord Adonis said after the ban was lifted it would be up to airlines to bring flight schedules back on track.
BAA, which operates many of the UK's airports, has said people should contact their airlines before travelling.
"Not all flights will operate during the early period of opening, and we will do everything we can to support airlines and get people moving," a spokesman said.
Some restrictions will remain on flights in UK airspace, but they will be much less severe than before.
Thousands of passengers have been stranded with planes grounded across Europe as a result of the ash cloud.
More than 6.8m passengers have been affected so far and 63,000 flights have been cancelled since Thursday.
Experts say the tiny particles of rock, glass and sand contained in the ash cloud from the Eyjafjallajokull volcano system could jam aircraft engines, as has happened in previous incidents of planes flying into plumes of volcanic ash.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.