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The alert sys­tem on a Delta Air Lines jet that flipped up­side down and burst in­to flames as it tried to land in Toron­to last month in­di­cat­ed a high rate of de­scent less than three sec­onds be­fore touch­down, a pre­lim­i­nary re­port said Thurs­day.

The Trans­porta­tion Safe­ty Board of Cana­da, which is­sued the re­port, con­tin­ues to in­ves­ti­gate the Feb. 17 crash-land­ing in which 21 peo­ple were hos­pi­tal­ized.

All 76 pas­sen­gers and four crew mem­bers sur­vived when the Delta plane ar­riv­ing from Min­neapo­lis burst in­to flames af­ter flip­ping over and skid­ding on the tar­mac.