Asked in Airplanes and Aircraft
How old must an infant be to fly on an airplane?
3 months old, carrying a certificate from National government with permission from Traveling Agencies and appropriate Authorities
This differs by airline: some allow babies as young as 1 week old to fly if they have a Medical Authorization. Some allow unrestricted travel for babies 2 weeks or older, except that you need the birth certificate if they are flying for free, to show that they are not above the eligible age. A BVD (Boarding Validation Document) is not required if a seat is purchased for the infant, because they are treated the same as children.