I had a recent issue where for some reason my daughters full name appeared on the baording pass missing off the last four letters of her surname as there is a limit on charatcers. (We are not Thai or Sri Lankan and dont have mile long names, )
I was very concerned about this but spoke to AA customer services who said it is common and the full name is encoded in the BP but not all printed out.
So shouldnt be a problem but definitely check with the airline