Each individual piece must be 50 pounds, not the sum of the two. For example, if one piece is 60 pounds and the other is 40, you'll have to transfer 10 lbs. into the other suitcase.
-reg person=2 bags each max. 50 lbs
-Elite= 2 bags each max. 70 lbs
-1st class/ businessfirst= 3 bags each max. 70 lbs.