They seem to be attempting to prove the parentage of the child(I flew with a newborn and they insisted on a birth certificate).
Also, no other airline has this policy, as far as I know. American and United did not care.
This may be a case of a corporate policy to verify age that the desk employees have decided is actually for anti-trafficking and have become Nazis about it. Or perhaps corporate sold it to them with “this might also prevent trafficking”.
Either way, the check-in workers are obsessed with the idea that this is a “parent verification system”
