near what is now Castlemore Road and McVean Drive in Brampton, Ontario. Memorial and witness accounts at the time reported the crash was in Woodbridge. This was because in 1970, prior to urban sprawl and changes in municipal boundaries, the site was closer to Woodbridge than Brampton. This was the first Air Canada accident involving fatalities and the first hull loss of a DC-8 series 63. In November 1963, another DC-8 of Trans-Canada Air Lines (the precursor to Air Canada) Flight 831, also bound from Montreal to Toronto, had crashed with a loss of 118 lives. Investigation A board of inquiry was established to investigate the crash. The board published its official report on January 29, 1971, in which the accident was attributed to pilot error. Eight recommendations were provided, including that the activating lever for the spoilers should be designed in such a way that it could not be activated while the DC-8 is in flight, that the manufacturer should reinforce the structural integrity of the DC-8's wings and fuel tank and that Air Canada training and operating manuals should clarify the operating procedures regarding spoiler arming and deployment. Aftermath Recovery and identification of bodies proceeded slowly after the crash because of the need to excavate the crash crater to a significant depth. More than 20 of the passengers were United States citizens, all of them listed as being from Southern California. On July 30, 1970, 52 victims, 49 of whom were identified, were buried at Mount Pleasant Cemetery, and in May 1971 an obelisk and stone monument were erected (Plot 24-1) at the site, with all 109 victims' names inscribed. In 1979, Air Canada added an additional memorial at the cemetery. In June 2002, Castlemore resident Paul Cardin, who had been inspired by a November 2001 Toronto Sun article revisiting the Flight 621 crash scene, discovered aircraft wreckage and possible human bone shards at the site. The Peel Regional Police investigated the findings, and it was later determined that the bones were not of recent origin, and had indeed come from the crash. Continuing searches of the crash site by archaeologist Dana Poulton and Friends of Flight 621 (a Brampton-based advocacy group founded by Cardin) produced hundreds of additional human bone fragments. Memorial garden dedication in 2013 Since the crash, the surrounding area of the crash site itself has experienced significant residential urbanization. In January 2007, the landowners,