Of course Tute, that's El Al, and that's international. From what I've seen domestically, it is another story completely- especially if the flight is running late.

But this also reminds me of the question someone asked me a while back about refunding a ticket after they'd checked in for their outbound but then did not end up taking the flight due to a delay like a ATC/mechanical or whatever. They were concerned about turning in the ticket for credit and I'g advised them that since there was no change fee etc since it wasn't discounted that they should be just fine. yet I don't know for sure.