Hi,
So I am booking a flight on Aeroflot.com from Moscow to Shanghai Russia. I am a dual US and Serbian citizen and will enter Russia using my Serbian passport as I do not require a visa with it.

Flying out of Moscow I will be flying on my US passport as the Chinese visa is in my US passport. When booking on aeroflot.com it asks for detail passport information. Is it all right to enter US passport info here even though I'll be going through customs (out of the country) using a Serbian passport?

Thanks!