Late 70's some of the Sydney flights used -136 and stopped in Hong Kong and Muscat BA012 I think..
Normally through Muscat about 0200 local time, but if late, ie. daylight, then it was often too hot to go direct to LHR and a tech stop would be made.
I was on one flight that stopped in Athens in the afternoon for two hours without a working APU.
After the Iran revolution in Jan 1979, more BA flights used Muscat instead of Tehran. I saw 4 BA 747s on the ramp together one night, I think they were all -136.