Transport black tool (3,5)

I believe the answer is:

jet plane

'transport' is the definition.
(jet plane is a kind of transport)

'black tool' is the wordplay.
'black' becomes 'jet' (similar in meaning).
'tool' becomes 'plane' (plane is a kind of tool).
'jet'+'plane'='JET PLANE'

(Other definitions for jet plane that I've seen before include "craft" , "Modern airliner" .)

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