My winter flights to Tokyo were recently changed by ANA and they've emailed me asking to confirm / cancel. I'm not yet sure if the replacements work for me, so I'm not rushing to confirm.
Does anyone know how long I can leave it before they cancel? I've emailed them, but it will come as no surprise that they've not got back to me. I'm assuming that it's probably something like 72 hours before the flight (or in that range), but I can't seem to find the info anywhere.