American is promoting its latest mileage offer as a buy-one-get-one-free proposition. And with some qualification, that's accurate.
The offer: Through November 15, AAdvantage members can earn 25,000 bonus miles for completing two round-trip flights on eligible routes. Since 25,000 miles will net you a free round-trip, the offer indeed amounts to getting one free after two paid trips.
The qualifier, of course, is "eligible routes." In this case, the list (printed in full on American's website) includes about 20 routes, 11 of which are to/from Chicago. Still, for anyone who might be flying the applicable routes anyway, this is a lucrative offer. Be sure to register.
The bonus may be earned twice, for a maximum of 50,000 bonus miles.