Both of our kids used car seats on planes until they were about 4yo or so.
Before you leave for the airport, make sure that you practice installing your car seat w/ a seat belt (there aren’t any lower anchors on airplanes) and that you can locate the red text on one of the labels stating that the seat is approved for use on aircraft. The flight attendant may ask to see the text and it will be smoother if you know exactly where to point!
I highly recommend rear facing as long as you can as it prevents the heavily discussed kicking issues. Once we had two kids traveling, we placed the older kid in the seat in front of the younger kid. Having your little one facing you also helps you be able to interact with them easier.
Use a collapsible luggage cart or a Traveling Toddler (strap to attach a car seat to a rolling carry on) to move the seat through the airport.
I generally sent my dh on board to install the seat while I stayed in the gate area and let our toddler burn off more energy before boarding. By the time we got on, the car seat was set up and he put most of the carry ons away.
Additionally, if your toddler is 2yo or older, I would talk to them about what to expect at the airport. Describe what it will be like to go through security, etc. We found it helpful to have one parent go through, then the child, then the second parent. Also, if there is a well loved stuffed animal or lovey, they need to know it has to go through the X-ray. Easier to manage that expectation than have a meltdown in the TSA line!
For the flight itself, I pack a small child’s backpack only w/ small toys and books for the trip. All the diapers, wipes, extra clothes, and snacks go in mom & dad’s bags. I tried to balance the backpack contents with some well loved favorites along with some new surprises (that they don’t see until the flight). Each item is introduced individually to prolong the joy of new, exciting stuff!
A cool item to bring in the backpack is a small, travel sized Magnadoodle. The small ones have attached “pens” and this avoids crayons or markers rolling around the floor of the plane. Stickers and sticker books are also excellent ways to pass the time. For even younger toddlers, a simple paper cup and a small character/figure playing hide and seek could amuse them for hours!
Don’t be surprised if your little one falls asleep in their car seat. My older one usually was out like a light before we even lifted off. The white noise of the airplane engines put her right out. The younger one didn’t sleep as much, but did occasionally.
Check out this
link at Car Seat Blog. It runs through recommended seats for airline travel, as well as installation and usage tips. At the bottom of the article there are links to other blog entries pertaining to using car seats on airplanes.
Good luck! With a little preparation, I found using the car seat on board actually made our flights easier. Our kids were secure in a familiar seat and they knew they had to stay in it just like they do in the car.
