Q. I have a three year old who weighs 37 pounds. Do I have to purchase an additional ticket or can she fly on my lap for free?

A. With air travel as uncomfortable as it is, why you’d want to have nearly 40 pounds in your lap during the flight is beyond me. In any case, only children two years old or younger are allowed to fly as lap children on domestic flights for free. On international flights, you’ll be charged 10 percent of the applicable adult fare.