Allowed on the plane.  Unlike many infant car seats which babies tend to outgrow around 6-9 months of age, these seat will accommodate virtually every baby until 12 months, and most kids until 18 months or older (baby must weigh less than 35 lbs and his head must be at least 1 inch below the top of the car seat).

The Snugride 35 is perfect for parents who do a lot of traveling in vehicles besides their own – taxis, rental cars, airplanes, etc. Since it fits onto most snap n’ gos and stroller frames that accommodate infant car seats, it's a breeze to get your child and car seat to where you're going – just wheel them on the stroller (no need to carry the car seat and baby).
 

Allowed on the plane.  A great seat for babies who have outgrown their infant carrier.  This convertible car seat accomodates babies 5 to 33 lbs rear-facing and goes forward-facing to 40 lbs.  It weighs only 11 lbs and fits onto the Combi Coccoro Flash stroller (sold separately) for very easy travel (just like an infant carrier). Installs very easily and tightly using the vehicle seat belt, which means it's a terrific option for travel outside of the US.

 Allowed on the plane.  Birth to 30 lbs rear-facing, forward-facing to 40 lbs. The car seat has a stroller built into it.

 Please note the following complications associated with the Sit n' Stroll:

• Rear-facing: The Sit n’ Stroll typically sits too upright for infants without adequate head control.  It's often difficult to install securely enough (so that there's less than 1 inch of movement) as the seat is very wide (it's wider than the LATCH anchors in the vehicle’s seat crack).

• Forward-facing: Unlike other forward-facing car seats, where the belt (safety belt or LATCH) that secures the car seat to the vehicle is behind the child’s back or just alongside the car seat, the belt path on the Sit N’ Stroll is across the child’s upper chest. This difference means that the child must be secured in the car seat BEFORE you install the seat in the vehicle AND that the car seat must be uninstalled BEFORE you remove the child from the seat. This isn't a problem if you're going in a taxi or other vehicle that you use for one-way rides (and therefore will not be leaving the car seat in regardless). However, if you're renting/sharing a vehicle and using that same vehicle frequently throughout your trip, installing and uninstalling this car seat for every ride may become cumbersome.

Allowed on the Plane, but does NOT work in cars.  If you know you'll have a correctly installed, age, height and weight appropriate car seat on the way to and from the airport, and therefore you don't need to bring a car seat with you on your flight, the CARES harness is a great choice.  It works with the airplane seat to restrain your child 22 to 44 lbs, and weighs only 1 lb.  It's a great way to keep your kid secure without having to bring your car seat with you--but again, its only an option if you KNOW you'll have a car seat getting to and from the airport.  

 

Not Allowed on the Plane.  Are you traveling in the US or Canada with a child who weighs more than 22 pounds? If so, then this extremely portable car seat is a great option. It installs quickly and easily, so when you get to grandma’s car or your rental car, you can be on the go in no time with your child extremely safe in a 5 point harness. It also comes with a convenient travel bag and weighs just 10 pounds.

This seat is not FAA approved (because it requires a tether or a shoulder belt, neither of which is found on an airplane), but will easily fit in an overhead bin on the plane. Your child will use the lap belt on the airplane just like an adult (note: the airplane seat belt fits much better than that in a vehicle).

NOTE – You MUST use the tether strap when using this in the car seat mode (kids 22-60 pounds). All Canadian vehicles have had tether anchors factory installed for many years, and factory installed tether anchors in US vehicles have been standard since model year 2000. Most countries outside the US do not have tether anchors in their vehicles – so in those situations you would use this seat as a booster if your child was more than 40 pounds (or a different seat if your child was less than 40 pounds).
 

Not Allowed on the Plane.  These are appropriate for kids AT LEAST 40 pounds (and at least 3 years old). Many boosters have lower weight limits of 30 or 33 pounds – but it is strongly recommended that kids use a 5-point harness car seat until reaching 40 pounds.  There are many of these on the market, but the most lightweight and travel friendly is the BubbleBum.