On an IFR plate, what does a green airport indicate?

A green airport on an IFR (Instrument Flight Rules) plate indicates that there is an Instrument Approach Procedure (IAP) available for that airport. This means that pilots can utilize the airport for instrument flying, which is crucial for safe navigation and landing in low visibility conditions. The presence of an IAP implies that there are published procedures to assist pilots during approach and landing, allowing access to the airport under IFR conditions. This is essential for ensuring that pilots can safely navigate to the airport using instruments rather than relying solely on visual cues.

In contrast, a VFR only airport would not have established instrument procedures; if an airport were closed, it would not be depicted in green; and the indication that no IAP is available typically would not use the green color. Therefore, identifying a green airport serves as a clear signal to pilots that instrument approaches are permissible and supported at that location.