All UK airports have reopened for business after the volcanic ash cloud drifted away from British airspace.
National Air Traffic Services (Nats) said all airports across the UK reopened at 7am.
Airports in the Republic of Ireland reopened at 4am after the Irish Aviation Authority (IAA) also lifted restrictions.
A statement from Nats said: "The no-fly zone imposed by the Civil Aviation Authority tracking the high density area of the volcanic ash cloud has moved west overnight and has now cleared UK airspace."
On Wednesday, travellers in Scotland, Northern Ireland and the Republic of Ireland were left stranded by the cancellation of hundreds of services.
Passengers seemed uncertain as to which airports were operating flights, a problem highlighted by Scotland's First Minister Alex Salmond, who accused the CAA of releasing a "vague" statement on Tuesday night which suggested all Scottish airspace would be closed when Edinburgh and Aberdeen Airports were open for the first part of the day.
Mr Salmond said: "Unnecessarily, some flights were cancelled, particularly into Edinburgh, because of the vagueness of the press release they (the CAA) put out.
"That can't be allowed to happen again. It's really, really important, where there are difficult messages, that press statements must be clear and not cause confusion."
Mr Salmond added that the CAA had since apologised.
CAA chief executive Andrew Haines has warned that the ash cloud could cause disruption for "the foreseeable future".
