Mounting passenger frustration over long taxiing times at some of China’s main airports – in some cases matching the duration of a short-haul flight – is putting pressure on operators to rectify management ahead of the country’s summer travel rush, with the popularity of flying already being challenged by travel on high-speed trains.Since last month, those landing at Guangzhou Baiyun International Airport, the country’s second-busiest by annual passenger throughput, have had to endure nearly an...