I apologize for not being clearer. "cheer pilot" is a word play for "helicopter", because you can form "helicopter" from the letters present in "cheer pilot". As for "aircraft whirling", it actually refers to the spinning of the rotors and not the aircraft body itself.

Overall, the clue "Aircraft whirling, cheer pilot!" is an attempt at concealing the answer using a mix of cleverness and a play on words for "helicopter".
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