Delvonte Tisdale’s remains were found last week in Milton, Massachusetts — nearly 900 miles (1,500 kilometers) away from his home in North Carolina — several days after he was reported missing.

Logan International Airport spokesman Phil Orlandella said investigators have requested flight path information and are looking into the “remote” possibility that the 16-year-old may have fallen from an aircraft.

The Norfolk, Massachusetts, district attorney’s office refused in a statement to directly address the plane theory, but said the investigation “remains active and ongoing on multiple fronts.” Tisdale was a member of the Air Force Reserve Officers’ Training Corps program at North Mecklenburg High School in Charlotte.