In what scenario will ATC clear IFR aircraft through Class F airspace?

The scenario where ATC clears IFR aircraft through Class F airspace occurs when permission has been obtained from the user agency. Class F airspace is a designation that typically indicates areas where certain restrictions apply, often because the airspace is managed by a specific entity or user, such as for military training or other functions. Consequently, before an IFR flight can navigate through this type of airspace, ATC must ensure that it has the appropriate authorization from the agency that controls the airspace. This is necessary to ensure safety and coordination within operations that may be occurring in that airspace.

The other scenarios presented do not adequately address the specific requirements governing Class F airspace. Even if a pilot requests to fly through, or if a flight plan is filed, or if the aircraft is operating under visual flight rules, these factors alone do not meet the regulatory obligation of obtaining permission from the controlling agency. Thus, the clearing of IFR aircraft through Class F airspace is contingent specifically on having that required permission.