Ryanair has discovered something airlines have long suspected: parents will pay almost anything to prevent their child from spending a six-hour flight seated next to a stranger. The UK’s competition regulator is now investigating the carrier over fees it charges families who want to sit together—a practice that transforms the simple act of keeping your kid in view into a premium service tier.

The logic is almost admirable in its purity. Why should Ryanair let you sit with your own child for free when they could charge you €10 to €20 per seat per flight? After all, the airline is already charging you to check a bag, to pick your seat, to use the toilet, and presumably soon to breathe the cabin air at a rate above the basic allocation. Parental togetherness is just another revenue stream waiting to be monetized.

What makes this genuinely interesting—beyond the obvious comedic absurdity—is that it exposes how far the low-cost airline model has stretched. Ryanair pioneered the idea of unbundling everything from a flight experience. Seats, bags, priority boarding: all à la carte. But charging to sit with a child you are legally responsible for feels like crossing from clever economics into something that actually breaks the unspoken deal between an airline and its customers.

The regulator’s investigation suggests the UK agrees. Whether this results in actual change or just becomes another regulatory reminder Ryanair ignores remains to be seen. Either way, the message is clear: if you want to fly with your family on Ryanair, bring your wallet. And maybe some duct tape.