FILED - Normally used in conjunction with flight plans, meaning a flight plan has been submitted to Air Traffic Control.
FILED ENROUTE DELAY - Any of the following preplanned delays at points/areas along the route of flight which require special flight plan filing and handling techniques:
(1)
TERMINAL AREA DELAY - A delay within a terminal area for touch-and-go, low approach, or other terminal area activity.

(2)
SPECIAL USE AIRSPACE DELAY - A delay within a Military Operating Area, Restricted Area, Warning Area, or Air Traffic Control assigned airspace.

(3)
AERIAL REFUELING DELAY - A delay within an Aerial Refueling Track or Anchor.

FILED FLIGHT PLAN (ICAO) - The flight plan as filed with an Air Traffic Service unit by the pilot or his designated representative, without any subsequent changes.
FINAL - Commonly used to mean that an aircraft is on the final approach course or is aligned with a landing area. (See Final Approach Course, Final Approach-IFR, Traffic Pattern, Segments of an Instrument Approach Procedure)
FINAL APPROACH COURSE (P/CG) - A bearing/radial/track of an instrument approach leading to a runway or an extended runway centerline all without regard to distance.
FINAL APPROACH FIX/FAF - The fix from which the final approach (IFR) to an airport is executed and which identifies the beginning of the final approach segment. It is designated on government charts by the Maltese Cross symbol for nonprecision approaches and the lightning bolt symbol for precision approaches; or when Air Traffic Control directs a lower-than-published Glide Slope/Path intercept altitude, it is the resultant actual point of the Glide Slope/Path intercep. (See Final Approach Point, Glide Slope/path intercept altitude, Segments of an Instrument Approach Procedure)
FINAL APPROACH, IFR (P/CG) - The flight path of an aircraft which is inbound to an airport on a final instrument approach course, beginning at the Final Approach Fix or point and extending to the airport or the point where a circle to land maneuver or a missed approach is executed. (See Segments of an Instrument Approach Procedure, Final Approach Fix, Final Approach Course, Final Approach Point)
FINAL APPROACH (ICAO) - That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified,
(1)
At the end of the last procedure turn, base turn or inbound turn of a racetrack procedure, if specified; or

(2)
At the point of interception of the last track specified in the approach procedure; and ends at a point in the vicinity of an aerodrome from which a landing can be made, or a missed approach is initiated.

FINAL APPROACH POINT/FAP - The point, applicable only to a nonprecision approach with no depicted Final Approach Fix (such as an on-airport VOR), where the aircraft is established inbound on the final approach course from the procedure turn and where the final approach descent may be commenced. The FAP serves as the Final Approach Fix and identifies the beginning of the final approach segment. (See Final Approach Fix, Segments of an Instrument Approach Procedure).