Another note: As soon as kid turns 2, you not only start paying 66-75% of adult fares



After they're 2, how do you pay less than 100%? On UA, I've always paid 50% (for a seat) for under 2 and 100% once they turn two. Miles post for the 100% fares, and aren't supposed to for the 50% fares, but sometimes they did ^ - just curious.