Icelandic volcanic ash is set to disrupt airline operations again, after the Irish Aviation Authority opted to close lower airspace over the whole of Ireland.
Restrictions will be imposed from 07:00-13:00. The authority says the country will fall within an area whose ash concentration is predicted to exceed tolerance levels set by engine manufacturers.
"The decision is based on the safety risks to crews and passengers as a result of the drift south of the volcanic ash cloud caused by northeasterly winds," it states.
Overflights of Ireland from the UK and Europe will not be affected but operations will be halted at Dublin, Shannon, Galway, Sligo, Knock-Ireland West, Donegal, Cork and Kerry.
Irish budget carrier Ryanair is warning that it expects delays and cancellations to flights in Ireland and Northern Ireland.