Question: Which airline has a base at Chengdu Shuangliu International Airport and Kunming Changshui International Airport?
Sentence (from "Chengdu Shuangliu International Airport"): Chengdu Shuangliu International Airport (IATA: CTU, ICAO: ZUUU) is the major international airport serving Chengdu, the capital of China's Sichuan Province.
Relevant evidence: No