
— Total operating revenue per available seat mile (TRASM) edged down 3.6% year-over-year, due to lower operating yields as load factor was up slightly.
— Cost per available seat mile, excluding one-time items, jumped by 3.3%. This was due to heavy maintenance amortization, maintenance, material and repairs, and other operating expenses.
— Spirit took delivery of nine new aircraft (seven A320neo and two A320ceo) during the fourth quarter, ending the year with 145 aircraft in its fleet.