Disabled passengers at Heathrow Airport are being forced to wait up to two hours for help disembarking planes, a report has found.
The Civil Aviation Authority (CAA) has labelled the UK's busiest airport as "poor" for its disability services - with Manchester, East Midlands and Exeter airports receiving the same low rating.
Leeds-Bradford is 'good' - the second lowest rating.
The CAA's Richard Moriarty said: "It is critical Heathrow raises its game in terms of the service it provides to disabled passengers.
"The good news is Heathrow recognises that, and Heathrow has put in place commitments and plans to do just that over the next year."
The UK's airports were graded based on a range of information - including how long passengers wait for assistance, how happy they are with the service, and how well the airport engages with disability organisations.
The report found six airports - Inverness, Glasgow, Glasgow Prestwick, Humberside, Birmingham and Norwich - provide "very good" assistance.
Disability charities broadly welcomed the findings of the report but added it's vital airports take action to improve.
Selina Mills, from Leonard Cheshire Disability, said: "You don't have to be specialist care trained to treat someone as an individual and to think about what they need.
"Everyone has difficulties in airports, they're complicated places but I think you just need to make sure your staff know what they're doing."
The CAA said it would continue to monitor standards.
Transport Secretary Chris Grayling said: "It is encouraging to see the overwhelming majority of UK airports providing a good service for passengers with a disability, but I am determined to push the aviation industry to do more."