Which statement describes Canadian Class A airspace?

Which statement describes Canadian Class A airspace?

• A. High level controlled airspace; IFR only; Clearance required; Mode C or S transponder required; Separation provided to all aircraft.
• B. Airspace where VFR is allowed with no ATC.
• C. Low level airspace with VFR only.
• D. Uncontrolled airspace with no separation.

Answer: (A)

Canadian Class A airspace is the highest tier of controlled airspace, defined as high-level airspace from FL180 up to FL600 where ATC provides separation for all aircraft. Entry requires explicit ATC clearance, and for practical purposes the operations are IFR-only, meaning VFR flights are not permitted there. A transponder with altitude reporting (Mode C or Mode S) is required to ensure proper identification and separation. This combination captures the essential characteristics: high-level controlled airspace, IFR-only operations with clearance, transponder requirement, and ATC separation for all aircraft.

Canadian Class A airspace is the highest tier of controlled airspace, defined as high-level airspace from FL180 up to FL600 where ATC provides separation for all aircraft. Entry requires explicit ATC clearance, and for practical purposes the operations are IFR-only, meaning VFR flights are not permitted there. A transponder with altitude reporting (Mode C or Mode S) is required to ensure proper identification and separation. This combination captures the essential characteristics: high-level controlled airspace, IFR-only operations with clearance, transponder requirement, and ATC separation for all aircraft.