From what I saw Swissport had all 3 rigs up and running and delays weren't too bad for them, ~1 hour or so which isn't anything unusual during heavy snowfall (and they even managed to de-ice a few non contracted airlines).
Swissport started of well, but by 13:00 were uncontactable with the BA1375 taking a 4hr delay and waiting eventually for the snow to melt.