Minutes before touching down at Toronto Pearson International Airport after relatively uneventful trip from Minneapolis, Delta Flight 4819 was cleared for landing on runway 23 under a westerly wind with gusts of about 38 miles per hour.

An investigation is underway into the Delta plane that crash-landed Monday in Toronto. What caused it remains to be seen, but here's what we know so far.

TORONTO (AP) — Investigators will consider the weather conditions, as well as the possibility of human error or an aircraft malfunction as they try to determine why a Delta Air Lines jet burst into flames and flipped upside down as it tried to land in Toronto, aviation experts said Tuesday.