The Pakistani situation is actually not unique.
There are precedents, for example:
https://en.wikipedia.org/wiki/2008_Mexico_City_Learjet_crash
A Mexican government Learjet plane carrying the Secretary of the Interior crashed in Mexico city due to a mishandling of the landing approach by the pilots (they flew to close to a 767 and got blown away by wake turbulence).
The pilots were in fact not qualified, and in fact got fake licenses to operate the Learjet from corrupt flying schools.
> Pilot Martín Olíva and co-pilot Álvaro Sánchez, were not certified to operate the Learjet 45. The investigation concluded that both pilots had received fraudulent certifications: Captain Olíva lied about the number of training flights he had made, and had issues on the few training flights he did complete, while Captain Sánchez lied about being a Learjet 45 instructor. Both men had taken advantage of a corrupt system to get false training documents and some unsigned Learjet 45 certification forms from their flight schools. These revelations led Mexican authorities to suspend the licences of both flight schools.