The Los Angeles Times has published an article entitled "The frequent fliers who flew too much. [2]" It discusses American Airlines' AAirpass, an airline ticket that gives the holder unlimited first-class travel for life, and some of the people who bought it. It also discusses investigations by American into alleged misuse of the AAirpass.
Links:
[1] http://www.library.northwestern.edu/libraries-collections/evanston-campus/transportation-library
[2] http://www.latimes.com/business/la-fi-0506-golden-ticket-20120506,0,3094073,full.story
[3] http://www.library.northwestern.edu/related-pages/frequent-flyers