There is no such rule. Most airlines will try to seat a small child with 1 parent,but there are no guarantees.
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If your child is big enough to do so (around 4 years and 40 lbs), you can have them sit buckled on the airplane seat. Bring a belt positioning device such as the RideSafer Travel Vest or BubbleBum in your carry-on bag for your car travels once you land.
Infants under 2 years old can travel at no charge in the lap of their parent (any age), or an accompanying adult 16 years or older traveling in the same cabin.
What is Ryanair's Family Seat Policy? For safety reasons, children under the age of 12 must sit beside an accompanying adult, and infants (aged 8 days to 23 months inclusive) must sit on an accompanying adult's lap. It is mandatory for an adult travelling with children under 12 (excl. infants) to reserve a seat.
An adult must take the child to the departure gate and stay until the flight is airborne. When you get to the gate, tell the gate agent you have an unaccompanied minor traveling on the flight. We'll board your child early so they can meet the flight crew and learn about the plane's safety features.
Each airline will have its rules about who can sit where, but a bulkhead seat is generally considered an excellent option for families traveling with young children. The bulkhead is at the front of the cabin and sitting in those seats usually guarantees you some extra leg room.
In fact, most regular airlines now charge for seat selection anyways. It's often around $10-$30 per seat per flight segment, so if you cave in and pay for that, it can add up quickly. You shouldn't do it. No matter which airline you're flying on, don't ever pay to select a seat.
Ryanair says if a person doesn't pay for their seat assignment, they are “randomly” assigned, which may result in them not sitting with their party. But the CAA found that when a passenger flies Ryanair, as compared to other airlines, the likelihood of being separated from their party doubled.
If you're not happy with the seats available to reserve for free, you'll then have the option to pay and secure seats together if you'd prefer. On easyJet flights, seats are allocated on a first-come, first-served basis. So the earlier you check in, the more likely you are to be seated together.
Once your child is 2 years old, you'll need to purchase a seat for them. The FAA recommends that children under 40 pounds continue to use a car seat and that children over 40 pounds use the seat belt on the airplane seat.
A Lap Child may be carried free of charge domestically. For international travel, applicable government-imposed taxes and fees must be paid, and a ticket will be issued for each person, regardless of age.
Travel Restrictions and Required DocumentationIs your child two years old? Or turning two years old en route? If yes, then a seat is required to be purchased for all flights in which your child is 2 years old.