Originally Posted by mikesaidyes

You have to call to book a ticket starting from a non-gateway city. Korean Air partners with MANY different airlines, so you could be on Delta or American. You simply just have to call them. They will inform you of the miles/fees accordingly.

If you reserve the two flights on one ticket, your bags will be checked all the way to your final destination.

Also, with free bags, the rules on how many free bags, size, carry on limits are determined by the airline that operates "the longest portion of your flights." So, if you fly Phoenix to Dallas to Seoul, Dallas to Seoul is longer so the Korean Air rules would apply for baggage.