The most common and most likely answer to this crossword clue is the 9 letter word SKYJACKED
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More clues leading to the result SKYJACKED
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The straight part
We know that "took a plane" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case took a plane = skyjacked.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
Crossword Answer definitions
SKYJACKED verb- To steal or commandeer (hijack) an airplane, usually by threat of violence to the passengers.