Grimsvotn volcano began erupting on Saturday
Some NI air passengers face disruption on Tuesday as a cloud of volcanic ash drifts over parts of the UK.
Easyjet flights from Belfast International Airport to Glasgow and Edinburgh between 0500 BST and 0900 BST have been cancelled.
Two Loganair flights between Belfast City Airport and Dundee will also remain grounded.
All three NI airports are advising anyone intending to travel to contact their airline before leaving home.
Aer Lingus flights between Shannon, Dublin and Cork and Edinburgh, Glasgow and Aberdeen have also been cancelled.
Last year, thousands of flights were cancelled across Northern Europe because of ash from the Eyjafjallajokull volcano.
Debra Harris from Belfast International Airport has said there is potential for disruption to flights beyond Tuesday morning.
“At the moment, it is focused on Scotland but as the week goes on, depending on the weather, there may be some other disruptions,” she added.
The Civil Aviation Authority has said ash levels would be graded as low, medium or high, and airlines would be notified if levels reached medium or high.
Airlines would then consider whether to fly, according to risk assessments already carried out, the CAA added.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.