Which statement is true regarding flight plans and ADIZ operations?

• A. A flight from Canada to the USA is not considered international
• B. A defence flight plan must be filed if flying into the ADIZ
• C. A flight plan must be filed if crossing within 25 NM of a military aerodrome
• D. A flight plan is never required for ADIZ operations

Answer: (B)

Within an ADIZ, air defense coordination relies on having a formal flight plan that states where you’re coming from, where you’re going, and when you’ll be there. For military operations entering the ADIZ, the required document is a Defence Flight Plan. Filing this plan ensures defense and air-space authorities know your identity, route, altitude, and timing so they can track and, if necessary, respond appropriately. That specificity is why this statement is the best answer: it directly reflects the rule that military flights into the ADIZ must file the Defence Flight Plan.

The other ideas aren’t accurate. Flying from Canada to the USA crosses an international boundary, so it falls under international flight planning rules rather than a defence-specific plan. Simply flying within 25 NM of a military aerodrome does not by itself mandate a Defence Flight Plan. And, in general, ADIZ operations do require a flight plan; saying a flight plan is never required contradicts how ADIZ procedures are designed to function.