My friend's flight was postponed to a yet unknown date due to a fault in the plane. He has a round trip, he has 2 stops before he reaches his destination. He was planning on staying there for 3 weeks.
However, his ticket back here is still 3 weeks from the original date. Does he have the right to extend his ticket date for free? Or does he have to pay to extend his departure date to come back?
For example, he was supposed to depart on 31 July but, it got postponed to 3 August, and he was supposed to come back 3 weeks after his departure. So does he have the right to return on 25/8 with no extra charges, or does he have to pay to postpone his ticket, which was originally 21 August?