If you have proof of travel (plane tickets) go to a passport agency in the USA and renew the child>adult passport that way--don't apply through the mail. Normally you get the new passport the next afternoon (assuming no weekend) and the original cancelled passport (with holes punched) is returned to you at the time. Depending on the location, you might need to make an appointment and I think a small fee for fast service is applied. Be sure to have all of the necessary documents when you go.