pics and video here:
http://www.dailymail.co.uk/news/article-3301828/Six-black-passengers-kicked-Spirit-Airlines-flight-unruly-seat-dispute-claim-discrimination.html
“According to witnesses, it all started with a dispute over a seat, which the African-American couples claimed was double-booked by the airline.”
Looks like someone thought they were going to get a free flight.