What must aircrew advise Ground Control of when calling for taxi?

When aircrew calls Ground Control for taxi, it is essential to inform them of the ATIS code. The ATIS (Automated Terminal Information Service) code provides Ground Control with vital information regarding current weather conditions, active runways, and any other pertinent operational data that may affect the aircraft's taxi and departure. By stating the ATIS code, aircrew demonstrate they are aware of the latest updates relevant to the airport environment, facilitating a more efficient and safe ground operation.

In contrast, while the aircraft's weight and the planned departure runway are important pieces of information, they are typically not required to be communicated during the taxi call to Ground Control. The estimated time of arrival at the hold short point (ETA) is also not necessary for this specific communication, as Ground Control provides instructions that dictate when and how to proceed to the hold short line. Therefore, offering the ATIS code helps ensure that all parties have the same operational awareness and can make informed decisions during ground movements.