ICAO – more than just a flight plan format

Older pilots may wonder why they used to be able to refer to “decision height” on an approach chart rather than “decision altitude.” Or why they now have to refer to their home airport, as I do, as “KFDK” (Frederick, Maryland), rather than the old “FDK.” What my pilot friends are dealing with is the work of a fairly obscure international agency, created under the auspices of the United Nations.