What is the required flight visibility when VFR northeast bound at 4,500 feet MSL passing north of the Johnston (M90) airport?

The required flight visibility for VFR (Visual Flight Rules) operations at 4,500 feet MSL depends on the airspace classification in which the flight is taking place. In general, for VFR operations in Class E airspace, which is likely the case passing north of Johnston Airport, the minimum visibility requirement is typically 3 statute miles for flights conducted at altitudes above 10,000 feet MSL if within Class E airspace.

Although the specific altitudes and visibility requirements may vary slightly based on local regulations and the specific nature of the airspace where you are operating, the standard minimum visibility for VFR flights above 1,200 feet MSL and below 10,000 feet MSL in most airspaces is set at 3 statute miles. This regulation helps maintain safe separation between aircraft and ensures that pilots have adequate visibility to navigate, avoid obstacles, and remain clear of other air traffic.

This visibility requirement aligns with the need for pilots to judge distance to terrain and other aircraft accurately. Though some other options like 2 SM, 5 SM, or 1 SM may seem plausible, they do not match the standard regulations indicating that 3 SM is the crucial visibility threshold for maintaining safety during VFR flight at the