Algumas autoridades de companhias aéreas reconhecem o cenário exato que você cria. O estado CAA do Reino Unido:
Young children and infants who are accompanied by adults, should ideally be seated in the same seat row as the adult. Children and accompanying adults should not be separated by more than one aisle. Where this is not possible, children should be separated by no more than one seat row from accompanying adults. This is because the speed of an emergency evacuation may be affected by adults trying to reach their children.
O estado FAA :
4) Passenger Assessment Process for Exit Seating. While the regulation specifically defines the criteria for persons occupying an exit seat, the method by which the airline employee assesses the person assigned to an exit seat should be defined by the air carrier in its company manual. This process generally requires a physical observation of the person and should require additional processes, such as conversation with the person, to determine if he or she meets the selection criteria (the person has the ability to hear, understand, and impart information, and is not distracted by other responsibilities such as caring for small children or other traveling companions, etc.).
As companhias aéreas podem recolocar os adultos sentados na fileira de saída se forem responsáveis pelas crianças, pois entendem que o adulto não pode assumir suas responsabilidades de saída acima dos cuidados com seus filhos.
Atualização: Uma nova lei acaba de ser aprovada nos EUA.
SEC. 2309. Assento familiar.
(a) In general.—Not later than 1 year after the date of enactment of this Act, the Secretary of Transportation shall review and, if appropriate, establish a policy directing all air carriers providing scheduled passenger interstate or intrastate air transportation to establish policies that enable a child, who is age 13 or under on the date an applicable flight is scheduled to occur, to be seated in a seat adjacent to the seat of an accompanying family member over the age of 13, to the maximum extent practicable and at no additional cost, except when assignment to an adjacent seat would require an upgrade to another cabin class or a seat with extra legroom or seat pitch for which additional payment is normally required.