How many airlines are there in Xi 'an Xianyang International Airport?

Hainan Airlines (HU), Shenzhen Airlines (), Air China (CA), Tianjin Airlines (GS), Capital Airlines (JD), Xiamen Airlines (MF), Sichuan Airlines (3U), Shandong Airlines (SC), Spring Airlines (9C), Okay Airlines (BK), Jixiang Airlines (HO) and. Chengdu Airlines (EU), Huaxia Airlines (G5), Hainan Airlines (Hu), China Eastern Airlines (MU), China Southern Airlines (CZ), Shanghai Airlines (FM) and United Airlines (KN), Korean Airlines (KE), Asiana Airlines (OZ), China Airlines (CI), Dragonair (KA) and Aviation (KA)