If one reads GUWonders posts you will see that while he denies it, most of his posts are negative regarding car seats for kids int airplanes.
First lets look at FAA: The Federal Aviation Administration (FAA) strongly urges you to secure your child in a CRS or device for the duration of your flight. It's the smart and right thing to do so that everyone in your family arrives safely at your destination. The FAA is giving you the information you need to make informed decisions about your family's travel plans.
Second any car seat that is FAA approved can be used on a US airplane - one one landing/ leaving the US. Athe american academy of pediatrics recommends at rear facing seat until 2 years of ager - until they reach the top height or weight limit allowed by the manufacture. Despite GUs scare tactics there is no reason to believe / support his claim that they are risky?1 DO NOT LISTEN TO HIM. All of the data while suggesting "for cars" the seats with load-legs are better than those without IN CARS, there is nothing to suggest that they are in airplane.