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If your aunt has her baggage checked through she would only have to pick up her baggage at terminal 3 customs, clear customs, then drop them off at a special baggage drop-off point located right after clearing customs. The baggage will transfer automatically to her connecting flight from at terminal 8. I'm asuming your aunt is flying Delta from Rome and then American to Argentina. Even though these are different airlines, the baggage can still transfer through a so-called interline system used by airlines at most airports. She will only have to travel on the AirTrain with her CARRY-ON baggage ONLY. If the airline wont let check her luggage all the way through, I suggest she INSISTS on them checking them through while checking in at Rome or wherever she's starting her journey. Lastly, even though her final destination is out of the US, she will still need to pick up her bags at customs at JFK but like I said before, she will be able to drop them off after clearing customs before she boards the AirTrain to terminal 8. I hope this helps.