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All answers having "Jet" as clue:

3 Character Answers:

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FLY

GAS

LAG

SET



4 Character Answers:

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EBON

INKY

LEAP

LEAR

NOIR

SPEW



5 Character Answers:

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ANGLO

BLACK

NFLER

PLANE

SABLE

SPOUT

SPRAY

SPURT



6 Character Answers:

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ENGINE

SQUIRT



8 Character Answers:

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AIRLINER

AIRPLANE



9 Character Answers:

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AEROPLANE

ASBLACKAS

COALBLACK

JOENAMATH



10 Character Answers:

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BLACKASTAR



12 Character Answers:

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ASBLACKASTAR



14 Character Answers:

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AIRPLANEENGINE