From a historical point of view the B727s did not replace the DC6s The DC6s were replaced by C130H numbers 7004 and 7005 in 1968 while 7001 - 7003 replaced the 3 Hastings in about 1965. The B727s did not arrive until the 1980's.People have been making this "decision" for quite a few decades considering the B757s replaced the B727 which in turn replaced DC6s so not quite sure what history we have to base this theory off.
I was at DEF head quarters when the B727's were offered to us by Boeing (they were trade in's for new aircraft at Boeing ) after Piggy had been embarrassed by the Aussie PM over our lack of VIP capable aircraft for him to travel in ( at that time we used a pallet of airline seats in a Herk) so the airforce spotting an opportunity put forward the Boeing offer to Piggy and he pushed it through. Pollies were in the past, good this way as when there ego's are dented and you provide an option available to restore the dented pride you can use this to get what you want
So you could say both Boeing and the airforce made use of Piggies dented ego.
As to the replacement of the B757 my personal view is that while a passenger type can be usefully employed, you can put passengers in a transport type aircraft but you cannot put a helicopter or truck or APC in a passenger type of aircraft, and we simply don't have the number of aircraft to really justify the more specialised passenger type of aircraft .
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