Look out the window. That is the foundation of Visual Flight Rules, the set of regulations that let pilots fly by reference to the ground and horizon rather than cockpit instruments. Weather minimums define when this is allowed, and they vary by airspace and altitude.

VFR gives pilots enormous freedom. No clearance needed in most uncontrolled airspace. No rigid route. Just see and avoid. The trade-off is that responsibility for separation shifts to the pilot, who must spot other traffic, avoid terrain, and stay clear of clouds.

Core VFR requirements

• Minimum visibility and cloud clearance
• See-and-avoid responsibility for traffic
• Day or night VFR depending on rating
• No flight into instrument conditions without clearance

Marginal VFR is the dangerous zone. Visibility drops, clouds lower, and a pilot without instrument training can fly into conditions they cannot handle. Many fatal accidents begin as VFR flight into instrument weather.