You probably know that babies under 2 usually fly for free on your lap but how do you score one of these empty seats for free? Simply by asking! You can ask when you first check in, the gate agent once you arrive to the gate, and you can ask a flight attendant! "Hi, I'm flying with my baby and I'd love to bring her carseat onboard because I heard it is safer. Do you know if the flight is full or if there might be any empty seats we could move to?" This has also worked for us several times!