Global Air Traffic Management (GATM) is a concept for satellite-based communication, navigation, surveillance and air traffic management. The Federal Aviation Administration and the International Civil Aviation Organization, a special agency of the United Nations, established GATM standards in order to keep air travel safe and effective in increasingly crowded worldwide air space.
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... for most vowels, which is used in various cases, but particularly when recording a shout, or a greeting.)
Vowels (with approximate English equivalents)
a - gut
aa ...