American Airlines is revising their AAdvantage frequent flier program and is now allowing one-way bookings at half the cost in miles of a roundtrip.

There are some benefits. The obvious one is that you can book one-way award tickets, should that need arise. And it would now be possible to mix and match between booking classes, e.g., first class one way, coach class returning.

Another benefit might be on hard-to-book routes: Let’s say you can find availability on the outbound, but not the return. You can then go ahead and book the outbound, to lock that in, and keep checking back to see if/when the return opens up. (If this strategy fails, of course, you’d have some fees to cancel that one-way ticket, or you might end up buying a cash fare for the return… but it’s another tool in your arsenal.)

The one-way ticket also means you can string together a series of tickets that criss-cross the country, or the globe — say, New York to Albuquerque on one ticket, Albuquerque to Portland on another, Portland to Tampa on another, and Tampa to New York again on a final ticket. Of course, each city pair is its own ticket, but you could create some pretty complex itineraries that weren’t possible earlier.

But…

After seeing a post by lucky that pointed to a message board discussion of the policy changes, I knew there was a downside coming. What WAS possible before, and what’s been dampened alongside this change, was the free stopover when flying American Airlines or its partners on an roundtrip ticket.

The revised mileage chart shows only one-way fares, and reference to stopovers has disappeared. In the FAQ’s for the new One Way Flex Awards, there is this: “Awards between North America and Europe, India, Asia, and Central / South America allow a stopover at the North American gateway. However, other one-way awards do not allow stopovers.” That’s a function of the change from roundtrips to one-ways, but it’s lame.

The old rules (found via a quick search that yielded the original stopover rule text on a thread at Flyertalk) permitted stopovers at either the US or the international gateway. (International stopovers on oneworld alliance tickets, which are calculated on the basis of miles flown, are still possible, since you can string up to 16 flight segments together for one mileage fare.)

Savvy travelers have long made good use of free stopovers to make their miles go further. This has especially been true internationally, where one could add a few days’ jetlag recovery in one city before catching a flight to the intended final destination. Those stopovers will still be possible under the new policy, but they’ll cost you an additional flight segment’s miles. That’s a downgrade.

A shame, really. American Airlines’ one-way awards would otherwise have been praised as a nice upgrade. Too bad they giveth, and they taketh away.