Core Viewpoint - The launch of the voluntary transfer service for domestic flights between Shenzhen Bao'an Airport and Shanghai Hongqiao Airport aims to enhance the travel experience for passengers by allowing flexible flight changes among different airlines [1] Group 1: Service Details - The "Shenzhen-Shanghai Express" transfer service is a collaboration between Shenzhen Bao'an Airport, Shanghai Hongqiao Airport, and four airlines: China Eastern Airlines, China Southern Airlines, Shenzhen Airlines, and Juneyao Airlines [1] - Passengers holding economy class tickets (60% off or above) on flights operated by the aforementioned airlines can transfer to other flights on the same route within 4 hours before or after the original flight departure time without incurring change fees [1] - Passengers with tickets priced at 80% off or above are also eligible for a waiver of fare differences when transferring [1] Group 2: Transfer Process - Passengers without checked baggage can process the voluntary transfer at designated service counters outside the airport isolation area on the day of the original flight before departure [1] - Detailed policies regarding the transfer service and counter locations can be obtained through official channels of the airlines and airports [1]