Delight in aircraft, say (9)
I believe the answer is:
transport
I believe this is a double definition.
'delight' is the first definition.
('transport' can be a synonym of 'delight')
'aircraft say' is the second definition.
(aircraft is a kind of transport)
'in' acts as a link.
(Other definitions for transport that I've seen before include "Coach, possibly" , "which may be public?" , "bus maybe?" , "Send (convict) to a penal colony" , "Overwhelm with joy" .)