I really need some advice for this one.I'm planning a trip to WDW for October with my husband and 2 boys ages 6 and 17 months.At the time of our departure our son will be 2 years old on that day.My question is how do I book the airplane flight knowing he wont be 2 years old until the day of our departure.Also will the airline make me pay for his seat going home.Please all responses will be greatly accepted.