139.551 - Transition for aerodrome operator certificate holders and applicants operating aerodromes servicing international regular air transport operations
139.553 - Transition for aerodrome operator certificate holders and applicants that operate aerodromes not servicing international regular air transport operations
139.555 - Transition for qualifying aerodrome operator certificate holders and applicants
139.557 - Transitional internal quality assurance for aerodrome operator certificate holders and applicants
