Spirit AeroSystems (SPR) reported preliminary Q4 net revenue Monday of $1.66 billion, down from $1.81 billion a year earlier.
Analysts polled by FactSet expect $1.55 billion.
In a filing, the airline operator attributed the lower revenue to the impact of its funding deal with airplane maker Boeing (BA), which was recognized in Q4 of 2023 and boosted its revenue for that quarter.
Shares of Spirit AeroSystems were up 1.8% in recent premarket activity.