To the booking code, a 13-year-old is an adult

Coverage of the UK announcement has been about money. The Department for Transport says a parent and child can currently be charged up to £104 on a return journey to sit together, and that some airlines charge as much as £40 to fix a minor mistake in a name ¹. Under the plan, airlines will have to seat children under 14 with a parent or accompanying adult free of charge, and passengers will be able to correct simple name errors for free ¹. The changes are set to follow Royal Assent of the Civil Aviation Bill, aiming to apply by next year's summer holidays ¹. Which? says it has challenged the seating charges for nearly ten years ².

What the coverage does not say is that the fee was doing a job. In this publication's reading, rated possible, a paid seat was how a family told the airline it belonged together. Remove the fee and the airline has to know that by itself.

The publication's reading, rated probable, is that compliance is a data problem before it is a pricing one: a seat engine can only seat a child free beside the right adult if it knows the child's age at travel and which adult is theirs, and the passenger type code carries neither: it stops at 11, and the only family link most systems hold is the booking itself.

What the booking actually knows

Each passenger in a booking carries a passenger type code. Travelport's developer documentation states that by default air requests assume all passengers are adults, and that a child is coded CNN followed by a two-digit age ⁷. Its agent help pages give the IATA definition of a child as a person between ages 2 and 11 inclusive, and note that age and date of birth have been required for child passengers on its 1G system only since 8 June 2022, while its Apollo system "continues to require only a Child PTC" ⁸.

The UK rule covers under-14s ¹, and so does the EU deal agreed in June 2026 ³ and voted on 7 July ⁴. The industry's child band ends at 11. A 12 or 13 year old is, in the passenger type codes Travelport documents, an adult ⁷⁸. That mismatch of definitions is confirmed by the documents cited. Whether UK carriers hold a date of birth for every passenger under 14 at the point a seat is assigned, rather than only at check-in, is unresolved.

Airline policy is built on the same band. Which?'s survey of carriers shows easyJet seating each child under 12 close to an adult on the booking, Jet2 endeavouring to seat under-12s with their adults or no more than one row away, and Ryanair's policy as recorded there requiring under-12s to sit beside an accompanying adult ⁶. The published policies, at least, are written for under-12s.

Who is whose

The second missing fact is the relationship. Which? reports British Airways guaranteeing that a child is seated with at least one adult "in the same booking" ⁶. India's regulator in 2024 told airlines to seat children up to 12 with parents or guardians "who are travelling on the same PNR" ¹¹. The booking is the only family link most systems have.

Families do not always book that way. A parent on a company ticket and a child booked by the other parent sit in two records that nothing links. The government release says "a parent or accompanying adult" and defines neither, nor whether the adult must share the booking ¹. The bill text was not reachable for this piece, so whether the duty stops at the booking is unresolved. If it does not, the airline needs a new linking step, a field in manage-booking or a question at check-in: new data capture, not a price change. That path is possible, not established.

Where the fee lived

Travelport's merchandising documentation describes a separate EMD (Electronic Miscellaneous Document) for payment of paid seats, an ASVC service record for each traveller and service where payment is required, seats returned per passenger ⁹. The unit of seat pricing is one passenger, one seat, one segment.

"This seat is free because a child under 14 in this booking is in the next seat" is a condition across two passengers, and a per-passenger seat price cannot express it on its own. In this publication's reading, rated probable, an airline can either teach pricing to waive the charge on that condition, or move the problem into the seat allocator.

Ryanair has shown what the second path looks like. After the Competition and Markets Authority opened an investigation into its €8 family seat charge, Ryanair said in June that parents who do not pay will get a free allocated seat after check-in, at the rear of the aircraft, while families who want seats further forward still pay ⁵. The CMA said its investigation remains open ⁵. That is the allocator route: a check-in routine has to find adjacent seats for groups it can identify, on aircraft whose front rows are already sold. Whether "together, but at the back" satisfies the UK rule is unresolved; the release does not address where the free seat must be ¹.

A name correction is a reissue

The Lufthansa Group's current agency guideline, version 1.8 of November 2025, records that the group abolished its name correction fee on 1 July 2024 ¹⁰. The machinery stayed. The guideline allows one correction per person, up to two letters, and says the person travelling can never be changed. Once a name is corrected the ticket must be reissued, and a new booking should be created whenever other airlines' flights are in it, to avoid their automatic cancellation. Name correction on EMDs, it adds, "is technically not always supported", in which case the EMD is refunded and reissued ¹⁰.

In that guideline, the fee sat on top of a reissue and, where other airlines' segments were booked, their automatic cancellation ¹⁰. Removing the charge does not remove the reissue, and a paid seat on its own EMD has to follow the corrected name. The release does not define "simple" ¹; Lufthansa's line runs through letter counts and nicknames ¹⁰. Where the UK draws it is unresolved until the detailed rules appear.

Where else this applies

The EU deal applies the same free adjacent seating to passengers with disabilities or reduced mobility and to pregnant passengers ⁴. In this publication's reading, rated possible, each time a rule protects a passenger by a fact the reservation does not hold as data, such as age on the day of travel, a relationship, or a need for an assistant, it becomes a data-capture rule wearing the clothes of a fee ban. The real cost then falls on booking flows and departure control rather than on revenue.

What to watch

Before the 2027 summer holidays, read the published family seating terms of the main UK carriers.

If they still say "under 12", the threshold has not reached the systems. If they say "under 14" and say nothing about separate bookings, the duty has been read as stopping at the PNR. If a carrier adds a way to link a child to an adult on another booking, it has built the data step described here.

This reading is wrong if the main UK carriers publish under-14 terms covering separate bookings without adding any linking field to their booking flow: the systems would then have known more than their public documentation suggests.

The connection between the fee ban and the booking data described here is this publication's reading, not a statement by the Department for Transport or by any airline or vendor named. Terminair carries no byline.