A rough idea is as follows:
BA & IB & VY - BA
United - United
Aer Lingus, Turkish Airlines, AirChina, EVA Air, TAP air Portugal, Croatian, Lufthansa group, Ethiopian, Sri Lankan, Royal Jordanian, South African Airways, Iceland air, Air New Zealand, Qantas, Hainan, American Airlines (Ramp only) all with Menzies
ANA, Singapore Airlines, Emirates, Garuda Indonesia, MEA, Qatar Airways, IranSir, PIA -Philippine Airlines, Cathay Pacific, LATAM, = Dnata
SAS and Flybe - Swissport
Virgin Atlantic, Delta, AF/KLM, JAL, Etihad Airways, Aero Mexico, Royal Brunei,China Southern, Jet Airways, KenyaAirways = Cobalt
Air India, thai Airways, Alitalia - Azzura Grd Services
Malaysia Airlines - ASC handling?
This is is a rough idea ...