How do you interrupt a lower priority message?

Using the phrase "BREAK FOR CONTROL" is the established protocol for interrupting a lower priority message in aviation communications. This phrase clearly communicates the intent to take control of the radio channel and allows the higher-priority transmission to proceed without confusion. In air traffic control and aviation communication, maintaining clarity and priority in messages is crucial for safety and operational efficiency.

When this phrase is used, it indicates to all parties involved that an urgent message must be delivered, thus overriding any ongoing lower-priority communications. This procedure helps to ensure that critical information can be communicated promptly, which is essential in fast-paced and potentially high-stakes environments like air traffic control.

The other options do not provide an effective means of interrupting a lower priority message. Simply waiting for the message to finish could lead to delays in important communications. Stating just your identification might not convey the urgency necessary to interrupt the current communication effectively. Changing the transmission frequency would likely disrupt communications altogether and wouldn’t address the immediate need for priority transmission. Therefore, using the specific phrase "BREAK FOR CONTROL" is the most effective and recognized method in this context.