Does OW have transit checkin at T4 or do I need haul my luggage to T8 to be rechecked for my AY flight to HEL. I am arriving with LAN Chile from Santiago in the morning so it would be nice to get rid of my luggage after customs at T4...I also hope AA can issue my boarding pass so that I do not need to wait until the AY checkin opens and I can access the AC and hit the showers in the morning after over 24hrs of travel (luckily in J, though) and a tight SCL transit (=no time for shower there later this evening..)

I have only done AA->AY transits at JFK (after the new T8 opened) so thanks for any insight.