Aircraft Model: The plane is a Fairchild-Hiller FH-227C, a stretched version of the Fokker F27 Friendship built under license by Fairchild in the United States.
Airline: Northeast Airlines was a prominent U.S. carrier, primarily serving New England routes to Canada and Florida.
Livery: The aircraft features the distinctive yellow-and-white "Yellowbird" livery, which became a widely recognized image for the airline in the late 1960s.
Merger: Northeast Airlines merged with Delta Air Lines in August 1972. The FH-227 was the only turboprop passenger aircraft type ever operated by Delta, and they were phased out of the fleet by 1974.
Registration: The specific aircraft in the image appears to be N374NE, which later flew with Air New England after the Delta merger.