Traveling with a toddler?!?

Ashley • Hi!! We have a 4 year old daughter Liliana Sue n our 🌈Savannah Grace is almost 10 months now!

so we are leaving on vacation in like 2 weeks. I honestly don’t think I’ve ever seen a car seat on a plane but looking on The airline website my almost 3 year old is to be in her car seat when the fasten seatbelt sign is on... at least that’s how I take it. I thought most people checked the car seats. Who can help me out here I’m a little confused!