Only thing to do is wait until after the baby is born, take the birth certificate and guardianship papers to any airport that has a ticket desk for the airline and you can book the ticket at that time.
It ends up more expensive due to the late purchasing of the infant's ticket, but in the grand scheme of things it's not the worst thing in the world.
What I find interesting is that you actually do not have to inform the airline you are in the process of adopting a child. But because the infant isn't with you on the incoming flight, they start asking questions. It's a red flag.
You really cannot blame them for wanting to make certain we are not kidnappers or traffickers. Hopefully these same policies prevent children from being taken from the country illegally.
Sidenote: We have now also been advised by the other adoptive parents that in the case of a transracial adoption it is best to always travel with a photocopy of the adoption decree. When it is obvious the child is not connected to you biologically, it raises questions in the minds of immigration officials, airline agents and security personnel. Especially when crossing international borders.