I am writing this as a public service announcement (a life pro tip) to all parents who fly with them. Please note that even if your car seat is Transport Canada-approved, you may not be able to use it on the seat that you purchased for your child, depending on the competence of the staff on board. They tell you so many different rules and the reasons for these rules, they can’t all be true. And even if you follow the rules on their website, they will try to gaslight you and tell you that it's your fault it doesn't fit, so the car seat will either have to go…