Rüppell’s vulture is considered to be the highest-flying bird, with confirmed evidence of a flight at an altitude of 11,300 m (37,000 ft) above sea level.
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Since we are in the ADS-B Flight Tracking thread I assume you tracked it.
Awesome.
S
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Or had a window seat and saw it in flight!
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It was in 1973, so i have some doubts about having it tracked via ADS-B