Delta confirmed the baby's birth aboard DL478, about 30 minutes prior to landing at Portland International Airport, thanking the doctor and two nurses who stepped in to assist the Delta flight crew in a statement to ABC News.
"We extend our sincere thanks to the crew and medical volunteers on board who stepped in to provide care to a customer onboard prior to landing in Portland. The health and safety of our customers is always our top priority, and we wish the new family all the best," Delta said.
In audio from the flight, shared by Broadcastify, a crew member can be heard saying, "The baby has been delivered on the aircraft. So, they're gonna be coming in with the baby delivered."
According to Delta, the crew requested priority handling with air traffic control, and the plane, which was carrying 153 customers and four flight attendants, was met by EMS after landing.
The airline added that its crew members "undergo comprehensive medical training" for such situations.
On its website, Delta states that it does not "impose restrictions on flying if you're pregnant," noting that it doesn't require any sort of medical certificate for pregnant passengers to travel.
ABC News has reached out to the Port of Portland, which handles operations for Portland International Airport, as well as the baby's family for comment.