What should be done if a pilot's ETA changes while operating in ADIZ?

When operating in an Air Defense Identification Zone (ADIZ), it is crucial for pilots to maintain clear and timely communication with Air Traffic Control (ATC). This is particularly important if there are any changes to the expected time of arrival (ETA). By notifying ATC immediately about the changes, the pilot ensures that air traffic procedures are followed and that all parties involved are aware of the aircraft's updated status. This is vital for safety and helps prevent potential conflicts with other air traffic.

Additionally, maintaining open lines of communication with ATC allows for a more organized airspace, especially in sensitive areas like an ADIZ, where security concerns are heightened. Pilots are responsible for adhering to regulations that govern their operations in such zones, and prompt reporting of any changes plays a key role in compliance and safety management.

In contrast, other options may not encompass the necessary protocols required in an ADIZ. Making independent adjustments without notifying ATC could lead to dangerous misunderstandings, while changing ETA only when landing may not provide sufficient notice to ATC for managing air traffic effectively. Lastly, informing passengers before ATC does not prioritize the necessary communication that is vital in airspace management, especially in controlled environments like an ADIZ.