Just hoping PJIA will check all the way through to SEA.
While your luggage will be "tagged" SEA at PJIA since you are connecting to a US domestic flight you'll still have to claim it upon arrival at MIA and clear Customs. Normally, if you have a connecting flight you can recheck your luggage as you exit the Custom Hall BUT since you are overnighting in MIA you'll have to wait until the morning to recheck your bags. AA will not hold bags overnight.
