People are always concerned about planes being "safe," but on a day-to-day basis, your biggest concern should be getting injured from unexpected turbulence. For the 2nd time in a week, a bout of turbulence caused injuries on a flight. An Air Canada flight from Shanghai to Vancouver made an emergency landing in Tokyo on Sunday after 4 flight attendants were injured when the plane encountered turbulence. Keep your seatbelt on. Your plane isn’t going to crash, but smacking your head on the ceiling is going to hurt like hell.