occurring or done before a flight: a preflight briefing of the plane's crew.
a preflight briefing or a ground check, as of an airplane.

1920–25; pre- + flight1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preflight (ˈpriːˈflaɪt)
of or relating to the period just prior to a plane taking off

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
Advertisers should upload and submit files directly to our ad portal, which
  provides online preflight and approvals.
Ethics are addressed in the compulsory tone of a preflight safety and
  fasten-your-seat-belt lecture.
Spend the day regaining preflight energy with a leisurely amble around the
  town's adventure suppliers.
Their preflight festivities seemed to emphasize a liquid diet.
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