It lists Jet2.com, Aer Lingus and Emirates as having not signed up to the initiative, which it describes as “ensuring passengers get access to an independent complaints service”.

Since its launch in 2016, 35 airlines have signed up to ADR, including most recently Norwegian, which signed up in December 2017, meaning almost 80% of passenger journeys in and out of the UK are now covered by the initiative.

The CAA calls it a “fair arbitration service”, which can legally resolve disputed complaints fairly and efficiently, limiting the need to go to court.

So far, more than 10,000 airline customers, have escalated a complaint to one of two ADR services approved by the CAA – CEDR and Aviation ADR.

Andrew Haines, chief executive of the CAA, called on Jet.com and other airlines to "commit to ADR in the interests of their passengers".

Since the launch of ADR in the airline industry, the UK CAA has also consulted with airports on introducing it.

Since the beginning of 2017, seven airports have signed up, helping resolve complaints around lost and damaged baggage and the special assistance disabled passengers are legally entitled to. These airports cover 76% of disabled passenger journeys.