Craft excellent courses on plain English speaking (9)

I believe the answer is:

airplanes

'craft' is the definition.
(aircraft)

'excellent courses on plain english speaking' is the wordplay.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'courses' becomes 'lanes' (course can mean a path or route).
'on' is a charade indicator (letters next to each other).
'plain english speaking' becomes 'RP' (Received Pronunciation, English dialect).
'lanes' after 'rp' is 'rplanes'.
'ai'+'rplanes'='AIRPLANES'

I've seen this clue in The Times.

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