In 2017 there was a total of 8,108 claims in US airports where Americans Airlines come out the number one with highest claims with a total of 1,631 including 221 from Miami International Airport (MIA).
Most of the claims still under Review disposition and are related to Passenger Property Lose at Checked Baggage.
I created the dashboard below to understand where this claims are created and which airlines are better or worse when it comes to handle your property.