Attacks, some claimed by the Pakistani Taliban, have risen, mostly targeting police and security officials
"We are following reports from Pakistan regarding fake pilot licences, which are concerning and represent a serious lapse in the licensing and safety oversight by the aviation regulator," an IATA spokesman said, adding that the organisation was seeking more information.
Pakistan's civil aviation authority has found that some 150 of PIA's 434 pilots have "dubious licences", the airline said.
An inquiry into a PIA crash that killed 97 people last month has pointed to pilots not following procedures.