airport codez
in the Airport ABCs: An Explanation of Airport Identifier Codes, we learn:
…’Z’ was reserved for special uses. One of the special uses for ‘Z’ is identifying locations in cyberspace…an example is ZCX the computer address of the FAA’s air traffic control headquarters central flow control facility. ZCX is not an airport but a command center just outside Washington D.C., that controls the airline
traffic into major terminals.
discovered from this boing boing post via kottke