In addition to paying less for the ticket, you also have the benefit of being able to make changes using the AA RTW desk (1-800-247-3247). Not everyone there is perfect, but they clearly have the most knowledge and best customer service of any of the Oneworld airlines. Date/time of day/carrier changes are free of charge, and ime, are generally done very cordially and efficiently. [As always, you might accidentally locate an inexperienced agent...in which case you should just call back until you find an agent who is cordial and efficient.]