I spent some time recently in the international arrivals hall of the San Francisco airport, waiting for relatives to get through customs after a long international flight. The waiting area for friends/family has an art installation -- the entire floor is made to resemble a crude map of the world, with cast metal plates at the approximate relative locations of many major airports. The plates are in a style somewhat resembling a pilot's approach plates, with navigation aids marked in authentic style, with the frequency and three letter identifier, both spelled out in capital letters, and represented in dot-dash format in Morse code. Yes, aviation navigation aids still transmit their identifiers in Morse, at a very slow rate, slow enough that a pilot who doesn't know the code can look at the map's pictorial depiction of the dots and dashes while listening to the CW ID repeating, and confirm whether he's tuned the station he wanted. I had plenty of time, and I looked at many of the airports. But I noticed something peculiar about Mexico. Or should I say, Meyico.