In addition to Class B, which other airspace types may require two-way communication to enter in practice?

• A. Class C and some Class D
• B. Class A
• C. Class E
• D. Class G

Answer: (D)

Two-way radio communication before entering airspace is about ensuring ATC or an advisory service can coordinate and provide traffic information. Class B always requires a clear ATC clearance, so talking to ATC is essential there. In practice, some Class G areas around busy airports operate with an Aerodrome Traffic Zone or an advisory service (like AFIS) that requires pilots to establish two-way contact to receive traffic information and follow entry procedures. Because of these local arrangements, two-way communication may be required to enter those Class G portions in practice, even though the airspace itself is designated as uncontrolled. The other airspace types either require ATC clearance by regulation (Class A, or Class C/D where applicable) or do not typically mandate two-way contact for entry in the same practical sense, so they’re not the best fit for this question.