Aerial shot of '72 Cup final game between the Bruins and Rangers:
Edit: In case you're wondering, it's Vic Hadfield and Eddie Westfall top left, Eddie Johnston in net with Bobby Orr in front, Derek Sanderson on Rod Gilbert, with Dallas Smith (#20) watching puck.
From the documentary... "While the helicopter provided some fantastic imagery during that playoff series, in retrospect, it was incredibly dangerous and risky. Additionally, many fans and players alike complained about the noise inside Boston Garden. It was the last time a full-size aircraft would be used inside an NHL arena. "