Not so much an `airworthiness` issue, but more to do with 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...
Has been mitigated for at Platform Safety meetings previously, but it now appears that the `appetite for risk` at ministerial level has been withdrawn.
A crying shame really.