Bringing a Car Seat on a Plane: FAA Rules & Every Airline's Policy

Yes. Per TSA's dedicated Child Car Seat page, car seats may be transported in carry-on or checked bags. In-cabin use during flight is governed by FAA regulation 14 CFR 121.311, which requires the seat to display a red-lettered label reading 'This restraint is certified for use in motor vehicles and aircraft.' All 10 major US carriers allow car seats to be gate-checked or counter-checked free of charge — separate from your paid baggage allowance. For in-cabin use, you must have a purchased seat for your child or an available adjacent empty seat. The safest action before any flight: locate the FAA certification label on your specific car seat to confirm it qualifies for in-cabin use.

No. All 10 major US airlines (Delta, American, United, Southwest, Alaska, JetBlue, Spirit, Frontier, Allegiant, and Hawaiian) allow one car seat per child to be gate-checked or counter-checked free of charge. Per Delta's published policy, 'Children's strollers and child safety seats are not counted as part of the standard baggage and therefore can be easily checked for free.' The free car seat exemption is separate from your standard carry-on and checked-bag allowance. Southwest includes the CARES harness in its free allowance: 'we'll be glad to check your CRS (car seat or CARES harness) for use at your destination.' The only potential cost: if your car seat exceeds the airline's weight limit for checked items (typically 50 lbs), standard oversize/overweight fees may apply.

Per FAA regulations (14 CFR 121.311), a car seat is approved for in-cabin aircraft use if it displays a red-lettered label reading 'This restraint is certified for use in motor vehicles and aircraft.' This label is required on all US-manufactured seats made after February 26, 1985 that have been tested and approved for aircraft use. Popular FAA-approved models include the Cosco Scenera Next, Graco Extend2Fit, Chicco KeyFit 30, and Britax Advocate. European seats certified under UN/ECE R129 (i-Size) are also accepted on US flights under FAA Advisory Circular 120-87 even though they are not approved for US motor-vehicle use. The sole FAA-approved harness alternative is the AmSafe CARES harness, certified under 14 CFR 21.305(d), for children 22–44 lbs and ≤40 inches tall. To confirm any specific seat, search the FAA's child restraint system database at faa.gov.

Booster seats (both backless and high-back) are not approved for use during taxi, takeoff, landing, or turbulence per 14 CFR 121.311(c)(1). This applies on all major US and international carriers. During safety-critical phases, children in booster seats must use only the aircraft's lap belt. The sole exception in the US is Frontier Airlines, which explicitly states 'booster seats can be used during the flight but not during takeoff or landing' — Frontier is the only carrier to document this cruise-phase permission. On Hawaiian Airlines and Alaska Airlines, published policies note that booster seats 'may not be used during take-off, landing, and surface movements' but are not explicitly prohibited during cruise. If your child is 22–44 lbs and ≤40 inches tall, the FAA-approved AmSafe CARES harness is the recommended alternative for all flight phases.

Per FAA guidance and airline policies, a car seat must be installed in a forward-facing aircraft seat, preferably at a window position. Route the aircraft lap belt through the car seat's designated belt path and tighten securely. The seat must not block any passenger's path to the aisle and may never be placed in an exit row or in the row immediately in front of or behind an overwing exit. Forward-facing car seats must be installed forward-facing; rear-facing infant seats are installed rear-facing against the seat back in front of them (requires checking that the aircraft seat reclines sufficiently). The car seat's harness must still be fastened around your child — the aircraft seatbelt alone is not sufficient. Allow 3–5 minutes for installation, which is why using family pre-boarding (available on 8 of 10 major carriers) is strongly recommended.

Per Allegiant Air's published child-travel policy, children seated in car seats must be placed in a window seat and may not be placed in an aisle seat, between a passenger and the aisle, or in the exit row or rows directly in front of or behind an exit row. Allegiant's narrowest seat configuration is 17.88 inches — car seats wider than this are unlikely to fit. A car seat requires a purchased ticket for the child or an available adjacent open seat. The CARES harness is accepted: 'The only harness-type device approved by the FAA is the AmSafe Aviation CARES. It is designed for children weighing between 22 and 44 pounds and must include a label that says FAA Approved in Accordance with 14CFR 21.305(d), Approved for Aircraft Use Only.' Booster seats are banned: 'Backless booster seats, safety belt extensions, and vest or harness devices are banned for use on aircraft by the FAA.' Car seats are gate-checked or counter-checked free. Allegiant does not offer documented free family pre-boarding.

Per Delta's published child-travel policy, FAA-approved car seats are welcome on all mainline Delta flights when the child has a purchased seat or a vacant adjacent seat is available. Window seat placement is preferred. Car seats are explicitly banned in Delta One flatbed seats on A330-200 and A330-300 aircraft due to the flatbed configuration. The CARES harness is explicitly allowed. Booster seats are prohibited: 'Booster seats, even if they bear labels indicating they meet U.S., UN or foreign government standards; Vest and harness-type child restraint devices other than the FAA-approved CARES restraint device' are not permitted during taxi, takeoff, or landing. Delta's Early Access boarding group — positioned between Zone 2 and Zone 3 — is available for customers with car seats and strollers. Car seats are gate-checked or counter-checked free of charge. Delta's damage policy includes a general disclaimer but no baby-gear-specific carve-out.

It depends on the airline and specific aircraft. Five airlines ban car seats in at least one premium cabin configuration. Delta One flatbeds on A330-200 and A330-300: prohibited. American Airlines First on A321T and Business on A321XLR, 777-200, 777-300, 787-800, and 787-900: prohibited. United Polaris business class on 767, 777, and 787: prohibited. JetBlue Mint on A321 LR (3NL) and A321 NEO Mint (3NS): prohibited (allowed only on A321 Classic Mint 32S configuration). Hawaiian Airlines First and Business on 787: prohibited. In first/business on these aircraft, the car seat can still be gate-checked free — it simply cannot be used in the premium cabin. On domestic first class and on aircraft not listed above, car seats are generally permitted if the child has a purchased seat. Always verify your specific aircraft type on your route before departure.

Technically no — but practically, yes on most flights. Per American Airlines' policy: 'To carry on a safety seat, you must have bought a seat for the child, or a seat must be available next to you. If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.' This reflects the policy across all 10 major US carriers — you need a paid seat or an available empty adjacent seat to use a car seat in the cabin. Children under 2 may fly as lap infants (free on domestic US flights with a boarding pass) — but the FAA's published position is clear: 'The safest place for your child under the age of two on a U.S. airplane is in an approved child restraint system or device, not in your lap.' Purchasing a seat is the only way to guarantee in-cabin car seat use.

Per JetBlue's published policy, car seats should be placed in a window seat and may be placed in a middle or aisle seat only if the adjacent seat(s) remain empty. Car seats may not obstruct a customer's pathway to the aisle and may not be placed between two individuals. The CARES harness is accepted: 'Child aviation restraint systems (CARES) are also certified by the FAA for use during all phases of flight including taxiing, takeoff, landing and during periods of turbulence.' Mint cabin restriction: car seats are allowed ONLY on A321 Classic Mint (32S configuration) and are NOT permitted on A321 LR (3NL) or A321 NEO Mint (3NS). Pre-boarding is available for families with children under the age of 2. Car seats are gate-checked or counter-checked free. JetBlue disclaims car seat damage liability under Contract of Carriage Section 19.

The AmSafe CARES (Children's Aviation Restraint System) harness is the only FAA-approved harness alternative to a traditional car seat for in-cabin use on US flights. It is certified under 14 CFR 21.305(d) and is designed for children aged 1 year and older who weigh 22–44 lbs and are ≤40 inches tall. The CARES harness attaches to the aircraft seatback and provides a four-point harness system during all flight phases — unlike a booster seat, it is approved for taxi, takeoff, landing, and turbulence. It weighs approximately 1 lb and folds into a small pouch, making it the most travel-friendly in-cabin restraint option. All 10 major US carriers accept the CARES harness. Most international carriers also accept it under JAR-OPS 1.730. The harness label must read: 'FAA Approved in Accordance with 14CFR 21.305(d), Approved for Aircraft Use Only.'

Per Southwest Airlines' published child-travel policy, car seats are accepted onboard with a purchased seat for the child. Window seat placement is required — not preferred, but required. Exit rows are prohibited. The 'certified for use in motor vehicles and aircraft' label is required. The CARES harness is accepted. After January 27, 2026 when Southwest switched to assigned seating, families traveling on the same confirmation number are assigned to the same boarding group and seated together; dedicated family pre-boarding was retired. Southwest's damage disclaimer is explicit: 'Southwest Airlines will not assume liability for damage to strollers, CRS's or car seats.' Gate-check and counter-check are both free. For parents who have a Southwest Rapid Rewards credit card or elite status, priority boarding may allow earlier access to install the car seat before the general boarding rush.

Per Spirit Airlines' published child-travel policy, FAA-approved car seats are accepted onboard with a purchased seat for the child. Key restriction: car seats may not be placed in any seat equipped with an inflatable seatbelt — Spirit uses inflatable seatbelts in certain rows, and no car seat harness path is compatible with this belt type. Car seats may not be placed in exit rows or in rows immediately fore or aft of the exit rows. Rear-facing car seats larger than 25 inches may not fit Spirit's seat configuration. The CARES harness is accepted: 'an FAA-approved Child Harness Device (CARES).' Spirit does not document free family pre-boarding — boarding priority requires purchasing Shortcut Boarding. Car seats are gate-checked or counter-checked free.