The Civil Aviation Authority (CAA) of Pakistan has stated that they have not made it mandatory for international travelers to show polio vaccination cards before boarding a plane.
They want travelers to be cautious of unverified online portals claiming to represent airlines and asking for polio vaccination cards. A letter circulating on social media about this matter was an internal communication from Islamabad airport and is not a polio-related travel advisory.
Instead, the CAA spokesperson advises travelers to check with their airlines about the health policies, including polio vaccination requirements, of the country they are traveling to.