AROUND 140 passengers of flight HU7846, who were delayed overnight in the city due to problems in their plane's pressure system, left the city yesterday morning.The plane, operated by the country's fourth-largest air carrier Hainan Airlines Co Ltd and bound for Xi'an in Shaanxi Province, took off as expected from Hongqiao Airport in the city's southwest at 6.30 pm on Sunday but hovered in the sky for about two hours before landing at Pudong International Airport to city's eastern.