Originally Posted by NatsDad
Didn't the Japanese 747's also get beefed up to cope with the high number of sectors they complete on domestic routes. I recall a JAL 747 crashing on a domestic flight and the indication was that it was down to the very high number of short duration flights that the aircraft wasn't initially designed for.
Are you thinking of the one that crashed in 1985 when the rear pressure bulkhead suffered a structural failure?. It crashed onto a mountain and IIRC there were some survivors (<10). I believe this is remains the worlds worst single aircraft disaster.
The accident cause was established as due to some faulty repair work by Boeing a few years earlier after the aircraft suffered a tail strike IIRC.