More than 3 per cent admitted knowingly carrying bladed items past security, while 2.2 per cent of female respondents and 3.7 per cent of male respondents also acknowledged intentionally carrying prohibited drugs onto the aircraft.

A survey of airline passengers found that more than 20 per cent had knowingly or unknowingly smuggled prohibited items past the US Transportation Security Administration checkpoints onto the aircraft, including at least 6 per cent who boarded the plane while unintentionally carrying prohibited knives or other bladed objects.