air pocket

(not in technical use) a nearly vertical air current that can cause an aircraft to experience a sudden change in altitude, usually a decrease.
Also called air hole.

1910–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air pocket
1.  a localized region of low air density or a descending air current, causing an aircraft to suffer an abrupt decrease in height
2.  any pocket of air that prevents the flow of a liquid or gas, as in a pipe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Water was up to the ceiling tiles, but there was an air pocket in the crawl
But the air pocket left pollutants with no escape route.
The low-pressure air pocket then pulls the blade toward it, causing the rotor
  to turn.
As the air in the claw hook is compressed by the rotation of the claw, it is
  transformed into a high-pressure air pocket.
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