The difference being that cabin. Aircraft have a cyclic period of pressurization. How many times it can go through it before metal fatigue become a problem. Decades ago windows were square. Cracks began at the corners, resulting in some dramstic loses of aircraft and passangers.I have taken DC-3s many times from Ft. Pierce, FL to Cap Haitien. Not pressurized but never had any issues, except once with turbulence from hell and a panicked woman.
We live and learn, or if we live we learn.