They haven't.One of my former employers had an Australian subsidiary running a major system on an old mainframe & running out of capacity. The UK operation had a similar mainframe which was being run under capacity & likely to diminish further, so they sent one section (effectively a small mainframe which could be connected to others to make a bigger one) out to Australia.
Kingsford Smith freight handlers dropped it. From the side door of a freighter to the ground.
So we got a replacement from the manufacturer (which had a business going temporarily re-purposing retired mainframes, or parts of them) & sent that out.
The freight handlers stuck a forklift into it, hard enough to punch a hole in the rather solid packaging & into the computer inside.
The manufacturers managed to find another, but warned us that this time they wouldn't be able to get a replacement quickly.
I understand that senior Kingsford Smith freight handling managers watched it being unloaded, having issued dire warnings to the crew of what would happen to them if they broke another one. Even secondhand, they were expensive. I marvel at the casualness that must have led to the previous smashes. It was on a pallet, securely boxed, marked with whatever the air freight equivalent of "Fucking expensive & fragile - drop this & you'll need new bollocks!" is, & they broke two of them. The mind boggles. How did they handle normal freight?
That was over 20 years ago. Maybe things have changed.
P.S. The order of the breakages may be wrong. I remember how they were both broken, but can't swear to which came first.
Before I retired I ran both air and road freight operations for a now closed major Aussie Logistics company that used to part own the old Ansett Airlines.
Could tell you some stories....
My very first Air Charter when I joined that business unit was for a Boy Scouts Band(from memory) to fly from Kingsford Smith to Lord Howe Island for ANZAC Day Memorial Services. In keeping with the purpose, we hired an old DC3 for the trip.
It took off, flew approximately 300 metres and splashed down into Botany Bay just off the third runway.