Irish airline Air Lingus has estimated that it lost €20m ($26.3m) last month due to the chaos caused by the volcanic ash cloud.
Airspace over parts of Scotland, Northern Ireland and the Republic of Ireland remain closed for a second day due to risks from another rise in volcanic ash levels.
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The UK’s Civil Aviation Authority (CAA) imposed flight restrictions on some airports in Scotland and Northern Ireland on 5 May from 7am GMT for 12 hours.
No flights will take off between 7am and 7pm at Glasgow Prestwick and Campbeltown in mainland Scotland and Stornoway, Benbecula, Tiree, Islay and Barra in the Hebrides.
Inverness Airport will be closed until 1pm local time, Derry until 7pm and Belfast International and Belfast City from 1pm to 7pm.
Flights were suspended at Donegal from 8am, at Sligo from 9am and Dublin and Knock from 11am.
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By GlobalDataThe CAA said a 60nm buffer zone, imposed around high concentrations of ash in the skies, was close to Edinburgh, Carlisle, Blackpool, Liverpool and Manchester Airports.
Airports in Edinburgh and north-west England will open, despite the proximity of the ash, according to the CAA.
