What is the first thing to ensure before communicating "READY FOR TAXI"?

Before communicating "READY FOR TAXI," the foremost priority is to confirm that the cabin is secure. This ensures that all passengers are safely seated, seatbelts are fastened, and there's nothing that could become a hazard during taxiing or takeoff. A secure cabin is essential for ensuring safety and compliance with regulations, as flight conditions can quickly change during taxi.

While securing passenger belongings, checking weather conditions, and ensuring the flight plan is filed are all important steps in the preparation for a flight, they do not take precedence over confirming the cabin's security. The safety of those onboard is always the top priority, and this requires that the cabin is ready before proceeding with any taxiing actions or communicating readiness to air traffic control.