An excellent previous post on this topic outlined the various different cases for how to travel on two passports.
One question relating to their Case 4: Different Names, Dual Citizenship Not OK.
(background note: this case involves traveller having Country A passport, and Country B passport, where Country A does not allow dual citizenship. Country C is a neutral third country where the traveller has the right to enter either visa free or with visa.)
When booking ticket A-C-A in Country A name, and C-B-C in Country B name, how do you manage to check into the C-B flight leg?
I.e. is it generally possible to book into the C-B flight leg without having to clear immigration in Country C, say at a transfer desk ? Or could you do this checkin online, and carry a printed boarding pass that gets validated at the transfer desk ?
I plan to travel through Changi airport in the near future, and am not clear if it will be possible to check into this second leg without having to go through immigration.