An UK excise duty on passenger air travel (over 5.7 tonnes MTOW / 20 seats).
Britain’s CMA is investigating Ryanair’s mandatory family-seat fee, assessed at around £8 per flight, to seat parents with children aged 2-11, amid concerns it may be unfair under consumer law and could involve drip pricing. Ryanair defends the policy as compliant and cost-saving for families.