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<p>and low visibility, can significantly affect air traffic control operations, leading to delays, diversions, and the need for alternate routing.</p>

<p><big>Language</big></p>
<p>According to requirements of the <a href="page.php?w=International_Civil_Aviation_Organization">International Civil Aviation Organization</a> (ICAO), ATC operations are conducted either in English, or the local language used by the station on the ground. In practice, the native language for a region is used; however, English must be used upon request.</p>

<p><big>History</big></p>
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