24 hour transit-Thank you for your time and patience.

Hi, We are a family of three (2 adults and 1 child) travelling from India to Canada, We have a Confirmation of PR and a valid visa for Canada to travel for each of us on our respective Indian Passports.

We are thinking of taking an Air Canada flight from India through Shanghai (20 hour layover in Shanghai) to Toronto, Canada

Can we avail the facility of 24 hour transit or do we need to just stay on the airport .... ?