Joint Force Air Component Commander (JFACC), is a United States Department of Defense doctrinal term.
It refers to an individual of general officer rank that is responsible for air forces within a joint operations environment. The term "air forces" encompasses aircraft of Air Force and Naval variants, not already designated to specifically support ground forces (i.e. a Marine Air Wing as part of a MAGTF or "organic" Army aviation assets)
The tool by which the JFACC tasks assets is called an air tasking order (ATO).
As defined in Joint Publication 1-02 1, the JFACC is:
"The commander within a unified command, subordinate unified command, or joint task force responsible to the establishing commander for making recommendations on the proper employment of assigned, attached, and/or made available for tasking air forces; planning and coordinating air operations; or accomplishing such operational missions as may be assigned. The joint force air component commander is given the authority necessary to accomplish missions and tasks assigned by the establishing commander."
While the position is usually held by an United States Air Force officer in most joint warfighting environments, an officer of other service can be a JFACC, if that service has the preponderance of air forces in theater (i.e. a naval aircraft carrier on station).