Which message type demands delivery within 10 minutes or less?

The message type that requires delivery within 10 minutes or less is known as Flash, designated by the letter Z. This classification of message is intended for urgent situations where timely communication is critical, such as emergency responses or critical operational information. Flash messages are prioritized above other types, and their swift delivery ensures that the necessary personnel receive vital information without delay.

In contrast, Immediate messages, which are designated by the letter O, are very urgent but have a slightly longer delivery timeframe of 30 minutes. Priority messages, represented by the letter P, are important but can be delivered within 3 hours, allowing for a more relaxed timeframe compared to Flash messages. Routine messages, categorized by the letter R, do not carry urgency and can take up to 6 days for delivery. Thus, Flash messages stand out as the most pressing type of communication by their immediate delivery requirement.