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All answers having "Plane" as clue:

3 Character Answers:

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JET

SST



4 Character Answers:

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AERO

BLIP

TOOL

TREE



5 Character Answers:

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AVION

AWACS

SHAVE



6 Character Answers:

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ASTRAL

BOMBER

EVENER



7 Character Answers:

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SURFACE



8 Character Answers:

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AIRCRAFT

AIRLINER

TURBOJET



9 Character Answers:

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RADARBLIP



12 Character Answers:

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SMOOTHABOARD



14 Character Answers:

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CARPENTERSTOOL

TYPEOFGEOMETRY



15 Character Answers:

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AVIATORSVEHICLE

EVENOUTASURFACE