Can I Bring a Booster Seat on a Plane? | Travel Safety Guide

No, belt-positioning booster seats can’t be used on a plane because aircraft seats lack the required shoulder belt.

You’ve booked the family flight, packed snacks, and then paused at the booster seat. It’s the same one your child uses in the car every day. Can it come along? And if it does, can your kid actually sit in it during the flight? The answers aren’t as straightforward as you’d hope.

Here’s the short version: Most belt-positioning boosters — both high-back and backless types — are not allowed for use onboard because airplane seats only have a lap belt. But you can typically carry the booster through security, store it in the overhead bin, and use it at your destination. The exact rules depend on the airline, your child’s weight, and the type of seat you own.

Can You Bring a Booster Seat on a Plane?

Yes — the Transportation Security Administration (TSA) allows child car seats and booster seats to be brought through security as a carry-on item or checked luggage. There’s no separate TSA restriction against booster seats themselves.

The catch is what happens once you board. According to child passenger safety experts, belt-positioning booster seats cannot be used on an airplane because they rely on a lap-and-shoulder belt to position the seat belt correctly. Airplane seats only have lap belts, which means the booster simply won’t do its job during the flight.

If your child is in a booster at home, you’ll need a different plan for the plane — either a forward-facing car seat with a five-point harness that’s labeled for aircraft use, or simply using the aircraft’s lap belt directly for an older child who meets the airline’s height requirements.

Why Booster Seats Don’t Work on Planes

It’s easy to assume that if a seat is safe in a car, it must be safe on a plane. But the physics are different. The seat belt system in a car includes a shoulder belt that crosses the chest and a lap belt across the hips. A booster raises the child so the shoulder belt hits the right spot. On a plane, there’s no shoulder strap — just a lap belt that buckles across the waist.

• No shoulder belt: Booster seats need a shoulder belt to position correctly. Without one, the child would simply be sitting on the booster with a lap belt alone — no better than using the aircraft belt directly, and potentially less stable.
• No FAA approval: Booster seats do not have FAA approval, as they do not meet aircraft safety standards. An FAA-approved label certifies that the seat has been crash-tested for aircraft use. Booster seats lack that testing.
• Airline policies differ: Every airline has its own rules. For example, Frontier Airlines says boosters can be used on board but not during takeoff or landing. Other airlines may not allow any booster use at all. Always check your carrier’s policy before you pack.
• Check the label: Any car seat that has a label stating “certified for use in motor vehicles and aircraft” can be used on a plane. Look for that wording before you assume a harnessed seat is allowed.
• Pack it as carry-on: If your booster is smaller than the airline’s carry-on size limits, you can store it in the overhead bin. Many backless boosters are compact enough to fit in a standard overhead compartment or under the seat.

The bottom line: you can bring the booster, but you probably won’t be using it during the flight. Plan an alternative restraint for your child onboard.

What to Do Instead: FAA-Approved Restraints

The Federal Aviation Administration (FAA) strongly recommends that children under the age of two be secured in an approved child restraint system (CRS) rather than held on a lap. For older children who have outgrown a booster, the FAA suggests using the aircraft lap belt directly if the child is tall enough to sit with their back against the seat and knees bent over the edge.

Per the TSA car seat carry-on policy, you can bring a car seat through security without any special steps. That includes both forward-facing harness seats (which are often FAA-approved) and booster seats. But only a seat with a proper aircraft certification label can be used during the flight.

Many families choose to buy a separate seat for their child and install a forward-facing harnessed car seat. Convertible seats and all-in-one seats often have the “certified for aircraft” label if the manufacturers have put them through FAA testing. Check your seat’s manual or look for a sticker that says “This restraint is certified for use in motor vehicles and aircraft.”

Your safest bet is to use a harnessed car seat with the aircraft label. If that’s not possible, the FAA and AAP still recommend buying a separate seat and using the lap belt alone for older children rather than holding them in a lap.

Tips for Flying with a Booster Seat

Even if you can’t use the booster on board, it can still be useful at your destination. Here’s how to make the trip smoother.

1. Measure the booster’s dimensions: Check your airline’s carry-on size limits (typically 22x14x9 inches). Many backless boosters fit within those limits. If it’s too big, check it at the gate or with your luggage.
2. Buy a separate seat for your child: You can only use a car seat on board if you’ve purchased a ticket for your child. Some airlines (like American Airlines) allow a free lap infant under two, but a car seat requires its own seat.
3. Review your airline’s policy in advance: Every airline has its own rules for car seats and strollers. Don’t rely on general advice — check your specific carrier’s website or call ahead.
4. Use a window seat if using a car seat: If you are installing a harnessed car seat, it must be placed in a window seat (not an aisle or middle seat) to allow other passengers to exit quickly in an emergency.
5. Gate-check it if needed: If the booster won’t fit overhead, you can gate-check it — just get a gate-check tag from the gate agent and leave it at the door of the plane. You’ll pick it up at the jet bridge on landing.

A little planning keeps the process simple. Arrive early so you have time to sort out the seat at the gate if needed.

FAA and AAP Recommendations

Both the FAA and the American Academy of Pediatrics (AAP) strongly encourage using an approved child restraint system when flying with babies and young children under 40 pounds. The reasoning is straightforward: turbulence can occur without warning, and a child held in a lap can become a projectile in a sudden jolt.

For children over 40 pounds who have outgrown a forward-facing car seat, the FAA child restraint recommendation says to use the aircraft lap belt directly — no booster needed. That child should be able to sit with their back against the seat and knees bent over the edge, which typically happens around age 6 or 7.

Some parents find it easier to keep using a lightweight, FAA-approved car seat for a 4- or 5-year-old, even if the child technically fits in a booster in the car. That way the child stays in a familiar restraint and the seat belt stays low over the hips. It’s not required by law, but it may add some safety margin during turbulence.

The Bottom Line

You can bring a booster seat on a plane as a carry-on or checked item, but you generally can’t use it during the flight because aircraft seats lack shoulder belts. Plan to have your child sit directly in the lap belt if they’re big enough, or use an FAA-approved harnessed car seat for younger children. Check your airline’s policy on booster seating and size limits before you leave.

For advice specific to your child’s weight, height, and your airline’s current rules, ask your pediatrician or consult your carrier’s customer service team — they can confirm what’s allowed on your exact flight.