So I ended up not taking my outbound flight - I had to stay in TLV for another day and they told me my ticket was not changeable at all so I'll end up buying a whole new ticket (my first time buying a charter flight and I end up getting punished for it). This morning, they called me to ask if I still intended to take the return flight. This was perplexing as I thought I lost the ticket since I didn't take the outbound. Is this even possible? Or is this some different rulebook because it's a charter?