Which feature of the 737 MAX contributes to its reduced weight compared to the 737-800?

The feature that contributes to the reduced weight of the 737 MAX compared to the 737-800 is advanced materials. The Boeing 737 MAX employs composite materials and advanced aluminum alloys in its construction, which help to decrease the overall weight of the aircraft while maintaining structural integrity and strength. These materials allow for more efficient aerodynamics and lower operational costs by enhancing fuel efficiency.

The use of a fly-by-wire spoiler system, while a significant technological advancement in aircraft control, does not directly contribute to weight reduction in the same way that the use of lighter materials does. Larger wing areas can increase lift but may also increase overall weight and structural requirements. Alternative fuel options, while contributing to environmental efficiencies, do not impact the physical weight of the aircraft.