Eastern Air Transport's energetic publicity department last week made copy of the letters "ZAA." The letters are a radio signal, not new but not previously publicized. Flashed by an E. A. T. copilot to his ground station it means the opposite of SOS: "m at proper position, flying on schedule, nothing to report."
Aircraft radio is slowly producing a lexicon of abbreviations which some day may be as familiar as nautical signals. The U. S. public hears little about them because all domestic transport lines, Eastern Air excepted, use radiophone (voice) transmission. E. A. T. planes are equipped...
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