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All answers having "Flying machine" as clue:

3 Character Answers:

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JET



4 Character Answers:

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AERO

GYRO



5 Character Answers:

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PLANE



6 Character Answers:

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COPTER



8 Character Answers:

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AIRCRAFT

AIRLINER

AIRPLANE



9 Character Answers:

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AEROPLANE



10 Character Answers:

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WHIRLYBIRD