I called the China Eastern Airline (shanghai), they said I have to buy round tickets for my parents, for their visa is B2 category, now I'm afraid what if the airline company wouldn't allow them to board the plane with one way ticket.
〉〉Ignore what the sales person said, s/he knows nothing about it, or s/he trys to sell you more by scaring you.
Under such circumstance, airline companies have no right to refuse the passenger to board the plane.
For your instance and assurence, I myself bought one-way tickets for my parents each and every time for so many times when they visited me during the past.
BTW, what "wandahp" suggested above is a useful tip -- actually I once used it myself, in case border officer has any questions about the one-way tickets.
