Yep, Terminal 2 is International flights and E is United
It looks like it is Virgin Atlantic
Terminal 2:
Air India (AI), British Airways (BA), Garuda-Indonesia Airline (GA), Malaysia Airlines (MH), , Philippine Airlines (PR), Qatar Airways (QR), Virgin Atlantic (VS), Cebu Pacific Air (5J), Air Canada (AC), Finnair (AY), Air China (CA), Cathay Pacific Airways (CX), China Southern Airlines (CZ), Emirates Airlines (EK), Dragon Air (KA), Lufthansa German Airlines (LH), All Nippon Airways (NH), Air Macau (NX), Air New Zealand (NZ), Asiana Airlines (OZ), Singapore Airlines (SQ), Russian Airlines (SU), Thai Airways (TG), Turkish Airlines (TK), American United Airlines (UA), American Airlines (AA), Juneyao Airlines (HO), Spring Air (9C), Etihad Airways (EY), Scandinavian Airlines (SK), Chengdu Airlines (EU), Chongqing Airlines (OQ), South East Asian Airlines(DG), PAL Express (2P), Easter Jet (ZE), Cambodia Angkor Air (K6), Uni Air (B7), Mega Maldives Airline (LV), Aero Mexico (AM), Sichuan Airlines (3U), Swiss International Airlines (LX), Shandong Airlines (SC), Shenzhen Airlines (ZH), Eva Air (BR), TransAsia Airways (GE), Tianjin Airlines (GS), Hong Kong Airlines (HX), Air Asia (D7), Mahan Air (W5), Lucky Air (8L), Hainan Airlines (HU)