More than 400 claims for holidays ruined by the Icelandic ash cloud a year ago have yet to be settled, according to reports.
About 400 cases have been taken to the Financial Ombudsman Service and are being adjudicated.
There are also “a few dozen” demands for refunds for flight tickets and costs such as hotels and car hire that have not yet been processed by airlines, the London Evening Standard reported.
The majority of remaining claims are against travel insurers which dispute whether the ash cloud that drifted across Europe represented a genuine “adverse weather event” covered by policies.
The claims reportedly range from £50 to £4,000.
Travel insurance companies including Europ Assistance and Axa refused to pay claims on the grounds that the ash cloud was not “a weather incident”.
A Europ Assistance spokeswoman was quoted as saying: “We have received a decision from the Financial Ombudsman Service which we are considering with our legal advisers and we will respond in due course.”
A Civil Aviation Authority spokesman said: “I understand there are a couple of airlines that are still in dispute with a number of passengers. There are some outstanding claims which airlines say are excessive.”
An estimated two million travellers, many on Easter holidays, were caught up in the chaos caused by the Eyjafjallajökull volcano.
Many were stranded overseas and had to make their own way home or pay for hotels caused by the closure of European airports from April 15 to 20.