Plain English Meaning

K4F2 is a short code that identifies a specific airport. The FAA assigns these codes so that pilots, controllers, and flight computers can refer to an airport quickly and without confusion, instead of spelling out its full name every time.

Full Definition

K4F2 is the FAA Location Identifier for Outagamie County Regional Airport's former designation, now more commonly referenced as KATW (Appleton, Wisconsin). In the context of Figure 4-54 of the Instrument Procedures Handbook, K4F2 appears as a four-character identifier used on instrument approach charts and in flight planning systems to uniquely tag a specific airport. FAA Location Identifiers are alphanumeric codes (typically three or four characters) assigned by the FAA to airports, navigation aids, and fixes for use in flight plans, charts, ATC , and databases.