Shenzhen Bao’an International Airport further reduced domestic check-in deadlines Thursday for flights operated by Air China, Shenzhen Airlines, Shandong Airlines, and Kunming Airlines. The cut-off time for passengers with checked baggage is now 35 minutes before departure (down from 38 minutes), and 30 minutes for those without. For Shenzhen Airlines flights to Beijing and Shanghai Hongqiao, the deadlines are 30 minutes (with luggage) and 20 minutes (without luggage)