I'm booked to fly BA873 tomorrow on KRK to LHR. A number of flight tracking websites are listing the inbound flight (BA872 ex-LHR) as cancelled (flighty, flightradar24, flightaware). Not sure what will happen tomorrow as BA hasn't officially cancelled either flight tomorrow. And it is the only BA flight pair between LHR and KRK tomorrow.

Wondering what to do, should I book a backup flight? Or sit and wait to see if the flight still runs or ask for assistance at check in.