Which statement about the 24-hour clock is true?

Which statement about the 24-hour clock is true?

• A. It avoids ambiguity by using four-digit times
• B. It uses the 24-hour clock only for international flights
• C. It uses 12-hour clock with am/pm for most flights
• D. It uses local time with daylight saving adjustments only

Answer: (A)

Using the 24-hour clock with four digits removes any chance of mixing up morning and afternoon. Writing times as 0000 to 2359 means 1 PM is 1300 and 1 AM is 0100, so there’s no AM/PM to misread, even when schedules cross time zones. In aviation, this four-digit 24-hour format is standard on timetables, flight plans, and logs to prevent confusion and ensure precise coordination across countries and times of day. It isn’t limited to international flights, and it isn’t correct that most flights use a 12-hour clock with am/pm. Nor is it accurate that times are only local with daylight saving adjustments; aviation uses consistent time representations (often UTC as a reference) to keep operations clear.

Using the 24-hour clock with four digits removes any chance of mixing up morning and afternoon. Writing times as 0000 to 2359 means 1 PM is 1300 and 1 AM is 0100, so there’s no AM/PM to misread, even when schedules cross time zones. In aviation, this four-digit 24-hour format is standard on timetables, flight plans, and logs to prevent confusion and ensure precise coordination across countries and times of day. It isn’t limited to international flights, and it isn’t correct that most flights use a 12-hour clock with am/pm. Nor is it accurate that times are only local with daylight saving adjustments; aviation uses consistent time representations (often UTC as a reference) to keep operations clear.