"...the lack of `safety` features fitted that are mandatory on commercial passenger carrying ac such as:
GPWS
FDR
CVR
Lack of emergency floor lighting to assist egress in dense smoke
etc etc..."
That list would put any civil aircraft off line for quite some time - and looks and sounds like a lack of "airworthiness" to me! Just like the lack of hush kits stops them from using many civil airports.
And most of those items are also required on freighters too!
Seems like the long term lack of investment in modern flying equipment and standards has finally caught up with the old dears.