What important credentials do IAA inspectors carry with them?

IAA inspectors carry proof of identity as an important credential while conducting their duties. This identification serves multiple purposes: it verifies the inspector’s authority to perform inspections and assessments at airports, ensures compliance with security protocols, and facilitates the identification of inspectors by airport personnel and other relevant authorities. Having this proof of identity helps maintain the integrity of the inspection process by assuring that inspectors are legitimate and authorized to operate in that capacity.

The other options, while potentially relevant in different contexts, do not serve the foundational requirement that proof of identity fulfills. Permission letters from airlines, for example, might relate to specific aviation operations but are not universally necessary for an inspector's authority. Certificates of training reflect the qualifications of an inspector but do not inherently validate their identity at the time of an inspection. Reports of previous inspections would provide historical context but are not credentials that an inspector carries to verify their identity.