While at least 18 people were injured, all 80 people on board survived. Right now, it’s not clear what went wrong. A passenger jet flipped onto its roof while landing in Toronto, Canada, the fourth major aviation accident in North America in the past three weeks.

Delta Air Lines is offering to pay $30,000 each to passengers on Delta Connection Flight 4819 that crashed while landing at Toronto Pearson International Airport on Monday afternoon. The Atlanta-based airline confirmed the amount Wednesday afternoon.