Thanks to everyone for the quick response.

I am flying on two separate tickets. I called the AA desk and they stated that they can deliver the baggage all the way to LED despite the fact that it's two tickets. I called FA and the rep stated that I would have to recheck my bags in Helsinki. The flights are about 4-5 hours apart. What is the general policy of AA and FinnAir regarding baggage? Is this something that will be determined by the AA agent at LAX?

Am I better off checking in for the 2nd ticket (HEL-LED) online, at JFK or is this something that can be done by AA agent at LAX? Thanks again.