There was a long thread on this earlier but I cannot find it immediately. The points I remember are:
ICAO does not 'issue' codes to airports. The national authority issues the codes and reports them to ICAO.
X catagory codes were limited by FAA procedures to government (military/NASA) airports. The only civilian X code for a while was XNA
/ KXNA for Northwest Arkansas Regional Airport, but several others have been issued X LID
The FAA has not reported KXTA as an official code to the ICAO as of the date of that thread in March. This was from a person who has access to the expensive ICAO databases. We normal web users cannot check official ICAO records, only subscribers who pay for the information get that access.
|Quoting wardialer (Thread starter):|
do they file it under KXTA while these online flight tracking systems show KTKM ot KTNX?
KTNX is the Tonopah Test Range - located about 65 miles north west of Groom Lake. It is also a highly classified area with access controlled by the Department of Energy/Sandia Labs like the Groom Lake facilities.
You will also see some Janet flights going to KTPH the civilian airport in the town of Tonopah
In addition to Janet flights to Vandenberg, Palmdale, China Lake and Edwards in California.
I have not seen anything on the code KTKM.
I'm not sure how Janet flights to Groom Lake are filed, but the concensus appears to be that KXTA / XTA is used for the paved runway near Groom Lake at this time.
It also appears at this time that the most sensitive secret location in the US is Area 5, about 15 miles west to 23 miles southwest of Groom Lake. Airport NV11 is the very highly secret/ restricted airport on the Yucca Flat / Yucca Lake in Area 5.
[Edited 2010-04-14 06:33:54]