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![en:handbuch_flughafen_klassifizierung [FTWiki - das FTW Wiki]](https://wiki.ftw-sim.de/lib/exe/fetch.php?media=en:airport_classification_001_engb.png "en:handbuch_flughafen_klassifizierung [FTWiki - das FTW Wiki]")
en:handbuch_flughafen_klassifizierung [FTWiki - das FTW Wiki]
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File:ICAO-FirstLetter.png - Wikimedia Commons
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