But there's a big caveat that comes with the report too: Where you live and where you fly determines whether top-ranked programs will work for you. For example, the report notes that JetBlue's TrueBlue program favors travelers "based in East Coast and Florida cities ... who primarily fly domestically and to the Caribbean."
The rest of the programs are:
Airline reward programs are free to enroll, at least at the basic level. Here are the entire U.S. News & World's rankings that compare reward programs.