Throwback: Spirit’s MD-80 Years

US-based ultra-low-cost carrier Spirit Airlines presently operates a fleet consisting entirely of Airbus twinjets. These will continue to play a key role at the airline in years to come, with orders in place for multiple A320neo family variants. However, did you know that, earlier in its history, Spirit also flew several designs from the rear-engined McDonnell Douglas MD-80 family? Let's examine this sub-fleet.