Amazingly, all three S-40s served long, successful careers without crashing or exploding, which is no mean feat considering the state of aircraft safety and engineering at the time. For context, the more streamlined successor, the S-42, had 5 of the 10 built were destroyed in some sort of horrible accident, along with one that was lost to World War II, and the much smaller predecessor, the S-38, had 28 of 101 built crash or explode in some manner or another.