Flew many times into MCO with little ones.

Rented a car seat the first time. Brought our own after that.

National will have them available. But like others have said, familiarity and cleanliness can be an issue. You’ll spend the first 10 minutes adjusting straps, wiping it down, etc. Installation is easy as 99.9% of new vehicles come with anchors nowadays.

Buy a car seat bag on Amazon and bring your own. We had a spare car seat solely for traveling. It had no bells and whistles, but it was verrrrry light. Made schlepping it through the airport super easy.

I assume you’re traveling with an infant-in-arms. At that age, I’d consider buying them their own seat and putting the car seat into it.