The Su-57 program has prioritised reducing maintenance needs and operational costs to avoid the very low availability rates that have plagued America’s F-117, F-22 and F-35 stealth fighter fleets. One notable means by which this had been achieved is through reduced reliance on radar absorbent coatings, which was achieved by using innovative solutions such as radar absorbent fibreglass. In contrast to American stealth fighters which consistently cost far more to operate than their fourth generation predecessors, this approach allows the Su-57 to potentially achieve lower operational costs than its direct predecessor the Soviet Su-27, thus allowing Russia to move its fleet into the fifth generation without either significantly raising sustainment funding or contracting the number of fighters in service.