For most U.S. flights, a child under age 2 may travel on an adult’s lap, so a car seat is generally not legally required. However, the Federal Aviation Administration (FAA) recommends that children ride in an approved child restraint in their own airplane seat. Children must have their own seat once they turn 2. Knowing the rules, checking the seat’s approval label, and confirming airline policies can make family travel safer and smoother.
Are Car Seats Required on Airplanes in the United States?
No. U.S. federal rules generally do not require a child under 2 to use a car seat on an airplane. A child younger than 2 may usually travel as a lap infant, held by an adult during the flight. The FAA nevertheless strongly recommends using an approved child restraint system (CRS) in a purchased seat because turbulence and other sudden movements can injure an unrestrained child.
Once a child reaches age 2, the child must occupy their own seat. An adult cannot continue to carry the child as a lap infant after the child’s second birthday. The child may sit in the airplane seat using the aircraft’s seat belt, or use an FAA-approved child restraint if it is compatible with the aircraft seat and airline rules.
These are general U.S. requirements, not a guarantee that every airline or international route follows identical procedures. Airlines can set additional policies, and rules outside the United States may differ. Families should check their carrier’s current guidance before booking and again before traveling.
What the FAA Recommends for Child Air Travel
The FAA advises that children travel in an appropriate child restraint secured in their own airplane seat, rather than on an adult’s lap. An adult’s arms cannot reliably hold a child during severe turbulence or an emergency. A properly installed restraint helps keep the child secured to the seat.
That recommendation is distinct from a legal requirement. A lap infant can be permitted under U.S. rules, but the FAA considers an approved restraint the safer option. Parents and caregivers can weigh the cost of an extra ticket against the added security of having the child restrained in a separate seat.
Children should not be placed in an adult’s seat belt while sitting on an adult’s lap, and an adult should not belt themselves and a child together. The aircraft belt is designed to restrain one passenger. Follow crew instructions and the restraint manufacturer’s directions throughout the flight.
Which Child Restraints Are Approved on Airplanes?
Not every car seat or child seat can be used on an aircraft. In the United States, look for a label on the restraint stating that it is certified for use in motor vehicles and aircraft. Wording may vary by product, but the label should clearly indicate that the restraint meets applicable motor-vehicle standards and is certified for aircraft use.
The FAA also accepts certain child restraints approved by foreign governments or manufactured under United Nations standards, subject to the applicable approval markings. Because labels and rules can be easy to misread, travelers should check FAA guidance and the restraint manual if the approval is unclear.
A restraint must be used according to its instructions. Its permitted direction—rear-facing or forward-facing—depends on the child’s size, the seat’s limits, and the manufacturer’s directions. The FAA approval label does not mean a restraint will fit every aircraft seat, so dimensions matter as well.
Car Seats, CARES Harnesses, and Booster Seats
A conventional, FAA-approved car seat is one option. Another is the CARES child aviation restraint, a harness designed for airplane seats. FAA guidance identifies CARES for children who weigh 22 to 44 pounds and are no more than 40 inches tall. It must be used as directed and is not suitable for every child or aircraft seating location.
Booster seats are different from approved car seats and should not be assumed to provide protection during every phase of flight. The FAA says booster seats are not approved for use during taxi, takeoff, or landing. An airplane’s lap belt must be correctly positioned, and a booster may not provide the belt fit it is designed to provide in a car. Check FAA and airline guidance rather than relying on a booster for flight safety.
How to Check Whether a Car Seat Can Be Used on a Plane
Before travel, check the restraint itself, the aircraft seat, and the airline’s policy. A product that is legal for aircraft use may still be too wide for a particular seat or restricted by the carrier’s procedures. Taking these steps in advance can help prevent delays at the gate.
- Read the approval label. Confirm that the car seat is certified for aircraft use, not just approved for use in motor vehicles.
- Check the manual. Review the child’s height and weight limits, installation method, and approved orientation.
- Measure the seat. Compare its width with the airline seat dimensions, while allowing for the shape of the armrests and belt buckle.
- Contact the airline. Ask about its child-restraint policy, seat assignments, and any restrictions for your aircraft or route.
- Bring the manual or product information. It can help clarify correct installation if a question arises.
Airline seat dimensions vary by aircraft and seating class. A restraint that fits one plane may not fit another, even on the same airline. Bulkhead seats, exit rows, and seats with special equipment may have additional restrictions. If the seat will not fit or cannot be secured properly, it should not be forced into place.
Where to Install a Car Seat on an Airplane
A child restraint is typically installed in the passenger’s assigned seat and secured with the aircraft lap belt, following the restraint’s instructions. Many airlines require a car seat to be placed in a window seat so it does not block another passenger’s access to the aisle. Specific seat-placement rules vary, so travelers should confirm the carrier’s policy.
Car seats generally cannot be installed in an emergency exit row. They may also be prohibited in a location that blocks access to an exit, interferes with crew duties, or prevents another passenger from using the aisle. Some aircraft seats have features—such as inflatable seat belts—that are incompatible with certain restraints.
After boarding, ask a flight attendant if the seat belt arrangement is unclear or the restraint does not seem secure. The restraint should not obstruct the passenger in the seat behind it or prevent the seat in front from functioning as required. Crew members are responsible for enforcing onboard safety rules.
Lap Infants: Rules, Tickets, and Safety Considerations
On many U.S. domestic flights, an infant under 2 may fly on an adult’s lap without occupying a separate paid seat. A lap infant still needs to be included in the reservation, and the airline may require proof of the child’s age. Policies for fees, documentation, and international travel vary by carrier and destination.
For international trips, a lap infant may need a ticket and may be charged a percentage of the adult fare or applicable taxes and fees. The child’s passport and entry documents may also be required. Families should confirm all requirements with the airline and relevant government authorities before departure.
A lap infant is not secured in an individual restraint, which is why the FAA recommends buying a separate seat and using an approved CRS. Parents should never assume they can hold an infant during takeoff or landing if crew instructions require the child to be positioned differently. Follow the airline’s procedures and crew directions.
What If There Is No Car Seat?
A child under 2 may generally fly as a lap infant on a U.S. flight if the airline allows it and the child meets its requirements. The child must be held by an adult when required, and the adult must follow crew instructions. This option is permitted under the general U.S. rule, though it is not the FAA’s recommended safety arrangement.
A child age 2 or older needs a separate seat. If the child does not use an approved restraint, the child must be secured with the aircraft seat belt when instructed and whenever required. The belt should fit according to crew directions; an adult must not share a belt with the child.
Travelers who are unsure about a restraint should contact the airline before arriving at the airport. They can ask whether the seat is permitted, where it may be installed, and what alternatives apply if it does not fit. Airline staff and flight attendants have the final say on whether a restraint can be used in a particular seating location.
Practical Tips for Flying With a Car Seat
- Reserve the child’s own seat. A lap infant cannot use a car seat in an unoccupied seat unless the airline permits it and the seat is available; booking a seat is the dependable way to ensure space.
- Choose a compatible seat assignment. Check whether the airline requires a window seat for the restraint and avoid exit-row seating.
- Keep the approval label visible. Staff may ask to verify that the restraint is approved for aircraft use.
- Practice installation at home. Familiarity with the belt path and tightening steps can make boarding easier.
- Use the restraint within its limits. Follow the manufacturer’s height, weight, and orientation rules.
- Plan for airport transport. A car seat may be checked or carried through the airport, but baggage handling can affect it. Check the airline’s rules and inspect the seat after travel.
Key U.S. Airplane Car Seat Rules at a Glance
| Situation | General U.S. rule | Safety note |
|---|---|---|
| Child younger than 2 | May generally travel as a lap infant; a separate seat is not federally required. | The FAA recommends an approved child restraint in the child’s own seat. |
| Child age 2 or older | Must occupy a separate seat. | Use the aircraft belt or an approved restraint as appropriate. |
| Car seat used onboard | Must meet applicable aircraft-use approval and airline requirements. | Confirm fit, seat assignment, and installation instructions in advance. |
| Booster seat | Not approved for taxi, takeoff, or landing under FAA guidance. | Do not assume it provides the correct aircraft belt fit. |
Official Guidance and Airline Policies
The FAA’s Flying with Children guidance explains child restraint recommendations and aircraft-use rules. The FAA also provides information about child safety seats and the CARES harness. The U.S. Department of Transportation’s family seating information addresses seating families together.
Rules and procedures can change, and airlines may apply additional restrictions. Before departure, travelers should review the current FAA guidance, the seat manufacturer’s manual, and the operating airline’s policy. If a trip includes connecting flights or a codeshare, checking with each operating carrier can help avoid surprises.