The Department of Transportation recently announced new modifications to existing rules regarding passenger protections when flight delays occur with passengers onboard. Most U.S. carriers already attempt to reduce long tarmac delays, reducing their chances for receiving stiff fines. These new rules now apply to foreign air carriers and airports as well.
Additionally, the new rules provide protection for passengers to receive baggage fee refunds should bags get lost. The baggage refund rules are somewhat soft. You can read the complete DOT ruling here.