Is it possible to buy return tickets for my gf who's Chinese from India itself on China southern, for a round trip from China to India? I mean buy 'Sold outside Ticketed Outside' ticket from India, as the same flight is quite cheap when the tickets are brought from India, but it’s about 1000rmb more expensive when bought from China. Is it legal and do china southern allow it? I know almost all international flights allow this and its not an issue, but china always follows its own rules. So just wanted to be safe. Otherwise I have to buy the tickets from China itself for my gf's trip.