What phrase is used to indicate that an aircraft is identified and can enter another controller's airspace?

The phrase "Radar contact" is used to indicate that an aircraft has been successfully identified on radar and is established in a controller’s airspace. This term informs both the controller and the pilot that the controller has visual confirmation of the aircraft's position and is actively monitoring it. Once the pilot is notified of radar contact, they can proceed with confidence that their position is known and that they are receiving air traffic control services.

The other terms relate to different situations in air traffic control. "Handoff approved" is a term used to communicate that one controller is allowing another controller to take responsibility for the aircraft. "Clear for approach" is specific to granting permission for the aircraft to descend and land at an airport, while "Transitioning airspace" generally refers to aircraft moving through different airspace sectors or types rather than indicating identification and authorization to enter controlled airspace.