For members redeeming an award on a partner airline, connecting travel will be provided by Alaska Airlines to the nearest gateway city of the airline partner at no additional charge. Connecting flights should be requested and reserved at the time the award travel is booked and ticketed. Travel is for connection purposes only and subject to availability.

Has anyone used this option?

If I live in SEA and redeem mileage to fly AA MIA-TPA, will AS fly me SEA-FLL? FLL being the "nearest gateway city."
Or will they fly me SEA-MIA on AA?
Or none of the above?

Thank you.