(CNN) -- Authorities are investigating what happened to a North Carolina teenager whose body was found along a flight path in Massachusetts with "trauma that was consistent with a fall from a significant height," a Massachusetts district attorney said. "It appears, more likely than not, that (Delvonte) Tisdale was able to breach airport security and hide in the wheel well of a commercial jetliner without being detected by airport security personnel," William R. Keating, district attorney for Norfolk County, Massachusetts, told reporters Friday. The mystery started November 15, when 16-year-old Delvonte was last seen by a sibling at their home in Charlotte, North Carolina, according to Keating.
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NEW: DA: The teen apparently breached airport security and hid in a plane's wheel well
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NEW: Authorities find shoes along a flight path similar to ones Delvonte Tisdale owned
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The teen's body was found by college students in Milton, Massachusetts
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Delvonte's body showed trauma "consistent with a fall from a significant height"
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During the investigation, Keating said, one local resident described hearing a loud, crashing noise shortly before 9 p.m. the night @placeholder's body was found.
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Last week, Massachusetts state and local police traveled to North Carolina to take samples of grease used in maintaining aircraft to see if the grease found on @placeholder's pants could be matched to that grease, Keating said.