sentence: Sichuan Airlines operates flights to Chengdu, Chongqing Jiangbei International Airport, Hangzhou Xiaoshan International Airport citation and Xi'an Xianyang International Airport.
modified: Sichuan Airlines operates flights to Chengdu, Chongqing Jiangbei International Airport, Hangzhou Xiaoshan International Airport citation and Xi'an Xianyang International Airport.