Aircraft's detailed schedule (4)
I believe the answer is:
'schedule' is the definition.
(I've seen this before)
'aircraft's detailed' is the wordplay.
'aircraft' becomes 'plane' (plane is a kind of aircraft).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'plane' with its final letter taken away is 'PLAN'.
(Other definitions for plan that I've seen before include "Scale drawing; scheme" , "propose" , "Project" , "Contrive" , "Intend" .)