Which class of airspace allows only IFR flights?

Which class of airspace allows only IFR flights?

• A. Class A
• B. Class B
• C. Class C
• D. Class G

Answer: (A)

In this airspace, the emphasis is on instrument-based navigation and ATC-managed separation. To enter and operate here, pilots must be on an IFR flight plan and receive explicit ATC clearance, with two-way radio communication and appropriate equipment. Because visual reference and wind-drift cues can’t be relied upon for separation at these altitudes and with high traffic, VFR flights aren’t permitted. This makes it the only airspace class that allows strictly IFR operations. Typically this upper, controlled airspace starts at a defined altitude (around 18,000 ft MSL) and extends upward, ensuring all traffic is conducted under instrument flight rules.

In this airspace, the emphasis is on instrument-based navigation and ATC-managed separation. To enter and operate here, pilots must be on an IFR flight plan and receive explicit ATC clearance, with two-way radio communication and appropriate equipment. Because visual reference and wind-drift cues can’t be relied upon for separation at these altitudes and with high traffic, VFR flights aren’t permitted. This makes it the only airspace class that allows strictly IFR operations. Typically this upper, controlled airspace starts at a defined altitude (around 18,000 ft MSL) and extends upward, ensuring all traffic is conducted under instrument flight rules.