The time constraint for transmitting ALNOT for the U.S. portion after receiving a Canadian ALNOT is within what time?

• A. 30 minutes
• B. 45 minutes
• C. 1 hour
• D. 2 hours

Answer: (C)

When urgent alert information crosses the border, there’s a defined window to share it so that pilots and operations teams have timely safety information. For a Canadian ALNOT that affects the U.S. portion, the U.S. side must transmit its corresponding ALNOT within one hour of receiving the Canadian alert. This one-hour limit strikes a balance between speed and ensuring accuracy, so U.S. airspace users get the warning promptly without undue delay. Shorter times could be impractical given verification steps, while longer times would leave responders uninformed longer than necessary.