Trying to book my son, who is 13, using miles and then linking his flight to an adult I know flying on the same flights. Couldn't do it online. Called customer service and they said they would do it, but would not honor the web special mileage rate and had a rate that was 40K mile more. They said nothing they could do since I didn't book online. Seems ridiculous they couldn't make an exception (I don't have AA status). What are risks to booking online with incorrect birthdate and then calling after booked to change birthday and link the account? Anyone have experience?