At £8 each way, the cost of a parent sitting next to a child on a Ryanair flight sounds modest — until you realise it is the only major airline flying out of the United Kingdom that charges for the privilege at all. Britain's Competition and Markets Authority announced on Thursday that it has opened a formal investigation into whether Ryanair's so-called "mandatory family seat" fee constitutes an unfair contract term under consumer law, a finding that could force Europe's largest low-cost carrier to overhaul a policy applied across the majority of its UK routes. Under Ryanair's current terms and conditions, at least one parent is required to sit alongside any child aged between two and eleven years old. To guarantee that arrangement, the parent must purchase a reserved seat — a fee that applies to both the outbound and return legs of every trip.

For all other passengers on the same aircraft, seat reservation remains entirely optional. The CMA argues this asymmetry is precisely the problem: the airline may effectively be billing families for fulfilling its own child-safety and disability-related obligations as set out under aviation rules, rather than offering the seat as a genuine optional upgrade. The regulator is also examining whether the charge represents a form of "drip pricing" — a practice in which mandatory costs are withheld from the headline fare and revealed only as a customer progresses through the booking process. Drip pricing has come under increasing scrutiny from consumer authorities on both sides of the Atlantic, with regulators in the United States and across the European Union separately targeting hidden fees in travel, ticketing, and subscription services.

Ryanair did not accept the characterisation quietly.