Spirit does have a frequent flyer program with different tier levels, as well as its own mileage credit card. All of my posts about the airline (most other peoples as well) have been under the "North/South American Airlines forum. There is a strong since by many the Spirit/Ryan Air deserve their own respective, independent forums.

They are both the most successful members of the Ultra-Low-Cost-Carrier Group, in their region. Both airlines are innovators for their industry and have taken the Southwest example, to the next level. Seriously Virgin America has a small FFP, yet along with JetBlue, they have their own forums. It should be noted that their are some growing ULCCs in Asia as well.

Seriously, nobody in their right mind would search for ULCCs in the "Budget Travel Forum"!!