During which condition are MTR routes flown under VFR?

MTR (Military Training Routes) are typically used for high-speed, low-altitude military flight operations, and they can indeed be flown under VFR (Visual Flight Rules) when below 1,500 ft. AGL (Above Ground Level). This is significant because VFR flights require pilots to maintain visual reference to the ground and navigate using outside visual cues.

When flying below 1,500 ft. AGL, MTRs may be active and available for VFR operations, providing pilots with the opportunity to conduct training without the constraints of IFR (Instrument Flight Rules), which would require more stringent navigation and communication standards.

Flying above 10,000 ft. AGL does not inherently restrict MTRs to VFR operations, as higher altitudes can often mean IFR operations are more applicable due to airspace structure and traffic management. The mention of nighttime operations alone also does not dictate the use of MTRs, since VFR can be conducted at night with appropriate equipment and visibility but is limited based on local regulations and airspace considerations. Pilots also do not necessarily have the freedom to request MTR flights anytime under VFR; these are scheduled and managed by military authorities, with specific conditions and operational requirements in place.