Definition
An air traffic control service provided within Class B airspace that includes IFR separation between all aircraft and separation of VFR aircraft from IFR aircraft, plus traffic advisories and conflict resolution between VFR aircraft. Every aircraft operating in Class B airspace must receive an ATC clearance before entering and must remain in two-way radio contact with ATC while inside.
Plain English
It is the level of air traffic control help pilots get inside the busiest airspace around major airports. Controllers keep all aircraft apart from each other, talk to every pilot, and require a clearance before anyone enters.
Context Anchor
You encounter Class B Service when flying in or near Class B airspace, usually around large, high-traffic airports where ATC clearance is required before entry.
Why Pilots Care
Pilots must receive Class B Service to legally operate in Class B airspace; failure to do so can result in airspace violations or loss of separation.
Intuition Check
“Service” does not mean optional help or customer service here. It means a specific ATC function: controlling and separating aircraft in Class B airspace.
Example Sentence 1
Approaching the Class B boundary, the pilot called approach control and waited for a Class B clearance before continuing inbound.
Example Sentence 2
Class B Service provided separation between the VFR traffic and the departing airliner inside the Class B area.