Which Annex contains the regulations for maintenance licenses in Continuing Airworthiness?

The correct choice is based on the structure of international aviation regulations as outlined by the International Civil Aviation Organization (ICAO). Annex 1 specifically pertains to personnel licensing, which covers the qualifications and training of flight crew. Annex 2 relates to rules of the air, governing the operations of aircraft during flight.

The focus of maintenance licenses, which are crucial for ensuring that aircraft are correctly maintained and in a condition for safe operation, is primarily addressed in the context of continuing airworthiness under Annex 3. This annex outlines standards and regulations necessary for the ongoing maintenance and reliability of aircraft, thus facilitating safe flight operations.

The other options, while they cover important aspects of aviation, do not pertain specifically to the regulations regarding maintenance licenses. Therefore, identifying Annex 3 as the source for these regulations aligns with the structured framework designed to ensure ongoing airworthiness and safety in aviation.