Lake Winnipesaukee, New Hampshire – July 28, 1973
On the afternoon of July 28, 1973, three teenagers, ranging in age from 15 to 18, took off from Laconia Airport in a Piper Cherokee and crashed just afterwards in Lake Winnipesaukee. The aircraft went down about a mile from the airport, off shore of the town of Gilford, N.H. None of the teenagers survived.
Source:
Providence Evening Bulletin, “Pilot, 16, Flew —— Plane; Crash Kills 3”, July 30, 1973