Although you can definitely stretch your miles to visit multiple cities across Europe
on a single award ticket, the one thing you do have to pay is taxes.
If you find a route that involves more than one carrier, oneworld Explorer Awards allow you to travel to multiple regions or cities within a
region on a single award.
Note: while you can mix SkyTeam partners (including Korean Air), you can not mix alliance and non-alliance
partners on a single award.
Obviously if you are going for a sign - up bonus on another card then it's worth it to ditch your
spending on a single award program because you'll be earning substantially more value from the bonus and more than likely be able to put that to use.
It essentially gives you a 2 - for - 1
deal on every single award flight you take, letting you take your +1 along for free and effectively doubling the value of your points.
* American Airlines does not permit travel to Asia 1 via Asia 2
on a single award, which is necessary if flying on Cathay Pacific.