+0.5 they will cancel the day of departure
yimach shemom
If anything that's just to lead the passenger on to think that all is OK and get more surprised at the airport so that is even worse than BA because usually a passenger will call to confirm the flight within 24hs of departing.
In any case, there have been cases where he didn't even cancel the ticket, rather he put notes on the res. that they shouldn't let the pax fly.