Son flew Spirit from FLL to SXM said very cramped paid for luggage as stated here but he got to SXM. He problem came on departure. No plane. He was told due to unforeseen circumstances next flight was next Saturday. No voucher for a hotel or food. He found seats on Jet Blue and got home.

When he asked for a refund Spirit said it was beyond their control and gave him $75. So what started as a cheap flight turned into more than we paid for a round trip Boston to SXM with checked luggage.

Buyer beware. Personally, I'd never take an airline that flies once per week. But the thought of staying and additional week in SXM sounds nice.