Does anyone know if Comair can or will check you in early for a flight from JNB to LHR on BA....We are arriving from Sydney on a seperate PNR on Wednesday and not flying out until the early evening of Thursday ( on a DONE4 ) so do we stay at the Intercontinental at the Airport until 3 hours before BA checkin opens or can we checkin earlier with Comair and go straight to the Lounge ??