...and now I'm stuck in London overnight because BA558 was cancelled. What really ticks me off is it was cancelled 30 minutes before departure. I find it hard to believe that BA did not know that the flight would not happen earlier due to the fog.

The "voucher/rebooking" lines had thousands of people lined up. I got lucky and ran into a duty manager from special services @ the "First" check in counter who thankfully went ABOVE and BEYOND to try and help me, going so far as to take me to the special services office so I could make phone calls. End result we have 2 "submit your expenses" letters since getting actual vouchers was impossible. Thing that really bothered me is an off-hand comment by a BA employee that most of the people lined up will never reach the window/agent. I keep thinking, yep that could have been me if not for a lucky break & a very helpful ba representative.

Is fog considered an extraordinary circumstance? My interpretation is that BA made a commercially minded choice to cancel the flight along with a slew of other short haul flights in favor of preserving their long-haul departures. The whole airport was not shut down. I'm curious if I'm eligible for compensation outside of the promissory letter to reimburse expenses up to the predefined limits. Anyone have experience with this sort of situation & BA?