You may NOT use a booster in booster mode. Basically, traditional boosters can't be used on airplanes since boosters need a shoulder belt ? and airplanes just have lap belts. However, if you are using the 5 point harness mode of a combination seat, you absolutely can use it on the airplane.

You can bring a booster seat on a plane, but you cannot use it during the flight. FAA regulations and international safety standards strictly prohibit the use of both high-back and backless booster seats during takeoff, landing, and turbulence. This is because booster seats are designed to be used with a vehicle’s "lap-and-shoulder" belt system to position a child correctly; since airplane seats only have "lap belts," a booster seat actually makes the child less safe by elevating them without providing upper-body restraint. If you bring a booster seat, you must either stow it in the overhead bin as carry-on or "gate-check" it with your other baby gear (which is usually free). For children under 40 lbs, the FAA "highly recommends" using an FAA-approved car seat (which will have a label saying "certified for use in aircraft") or a CARES Harness, both of which attach directly to the airplane's lap belt to provide proper safety.

Yes, booster seats are generally allowed on planes, but whether you can use them during the flight depends on the airline’s policies and the type of booster seat. Here’s what you need to know:

1. FAA & International Regulations

• The Federal Aviation Administration (FAA) and most international aviation authorities allow car seats (including some booster seats) if they are FAA-approved (look for a label stating compliance with FMVSS 213 and FAA certification).
• Backless booster seats (without a harness) are not approved for use during takeoff, landing, or turbulence because they require a seat belt that loops around the child (which airplane seat belts don’t do).
• High-back boosters with a 5-point harness (if certified) may be allowed if they fit within the airplane seat dimensions.

2. Airline Policies Vary

• Most airlines (e.g., Delta, United, American) permit FAA-approved car seats but may restrict booster seats without harnesses.
• Some airlines (like Southwest) explicitly prohibit backless boosters during flight but allow them as checked baggage.
• Always check with your airline before flying.

3. Using a Booster Seat on a Plane

• If the booster is FAA-approved, you can secure it in an airplane seat (must fit within the seat width, usually ≤ 16 inches).
• If not approved, you’ll need to check it (often for free as “child equipment”).

4. Alternatives

• For younger kids, consider an FAA-approved car seat (like the Cosco Scenera Next).
• Older kids (4+) may use the airplane seat belt alone (lap belt only).

Best Practice:

✔ Call your airline to confirm their policy.
✔ Bring an FAA-approved car seat if your child needs restraint.
✔ If using a booster, be prepared to check it if not allowed in-flight.

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