Spirit now has no recline seats.
Spirit Airlines seats: New Spirit Airlines planes have seats that don’t recline - South Florida Sun-Sentinel.com

"Spirit's new stationary seats weigh less offering greater fuel economy, Pinson said. In addition, there are fewer moving parts built into the seat, which minimizes maintenance costs associated with broken seat backs. Pinson said the result is lower fares.

Hmmm, a 28 inch seat pitch and carryons under the seat......sounds a "little" cramped.