What’s the likeliest situation when, on the day of a flight, seats are still showing as blocked but not occupied (and are not for sale)? Looking at today’s BA 1345 which I’d like to FCOD to but has no availability, and I can see 14C and 21F blocked out - assume it’s unlikely to be faulty seats although not impossible. Guess the other reason would be that they need a couple of seats to transport crew?