The Air Transport Association, the airlines' trade group, said it is an infrequent occurrence that somebody gives birth on a plane and said that airlines are as prepared as can be. Airlines have protocols in place for medical emergencies, including child birth. Airlines set their own policy as to how far advanced a woman can be in her pregnancy and when a doctor's express approval is required.
Most U.S. airlines place no restrictions on travel during the first eight months of pregnancy; some require a doctor's certificate stating the due date and that the woman is fit to travel. Of the association's members, four require a doctor's certificate within seven days of the due date; one requires it within 14 days and three require it within 30 days).
When a pregnant woman flies, the Air Transport Association said, she should keep her circulation moving by doing foot and ankle exercises in her seat and getting up to walk down the aisle when it is safe to do so. Keeping hydrated is also important.
The flight was almost completely full with 123 passengers out of a possible 137 onboard. There were also three flight attendants and the two pilots on the Boeing 737.
And for those wondering: in this type of situation, the baby is usually give a birth certificate in the state where the plane lands.
With reports from ABC News' Desiree Adib and Dan Childs.