Originally Posted by
ruckzac
You could argue that the phrasing "midnight of the departure date" is ambiguous as to whether it means the start of that day or the end of that day, but I'd be uncomfortable relying on the latter definition. Furthermore, cancelling the ticket after the departure time would constitute a no-show which is expressly addressed in the fare rules for non-refundable tickets:
I agree that it's ambiguous, though based on past experience "midnight" refers to the end of the day.
I have not personally attempted cancelling after the scheduled departure time, though remember reading in another thread that others have been successful doing so.