Upvote:1
DEPARTURE
refers to the first flight, meaning your friend's flight on January 5th. He is now AFTER DEPARTURE
and those conditions apply, meaning he is not allowed to make any changes any more.
That said, in my experience airlines are often more flexible than the fare conditions require them to, particularly when there is money to be made in the form of change fees. So I would encourage your friend to call them and ask.