The turbulence happened at 36,000 feet.
Intense turbulence struck an Air Canada flight to Australia on Thursday and sent unbuckled passengers flying into the ceiling, forcing the plane to land in Hawaii.
The flight from Vancouver to Sydney encountered "un-forecasted and sudden turbulence," about two hours past Hawaii when the plane diverted to Honolulu, Air Canada spokeswoman Angela Mah said in a statement.
"The plane just dropped," passenger Stephanie Beam told The Associated Press. "When we hit turbulence, I woke up and looked over to make sure my kids were buckled. The next thing I knew there's just literally bodies on the ceiling of the plane." A woman behind her hit the ceiling so hard that she broke the casing of an oxygen mask, said Beam, of Colorado Springs, Colorado.
Of the 37 passengers and flight crew members injured, nine had serious injuries, emergency responders said, citing Hawaiian officials. Thirty people were taken to hospitals.
Honolulu Emergency Medical Services Chief Dean Nakano said the injured ranged in age from children to the elderly.
Customs agents and emergency responders met passengers at the gate at the Honolulu airport to ensure they could get medical attention quickly.
Honolulu Emergency Services Department spokeswoman Shayne Enright said injuries included cuts, bumps, bruises, neck pain and back pain. More than two dozen people were taken to hospitals, she said.
"I watched a whole bunch of people hit the ceiling of the plane," said another passenger Alex MacDonald. "A couple of the air hostesses were bringing food out at the time, and they hit the roof as well." Passenger Luke Wheeldon told Honolulu news station KTIV about half the passengers weren't wearing seatbelts.
"There was no warning and then half of them, their head hit the roof all at once," he said. "And I went, 'Oh, this is a bad day.'" Babies and children were crying as crew members went through the cabin assessing injuries. About
15 minutes later, there was an announcement asking for passengers who are medical professionals to help, Beam said.
"The seat in front of me, the girl hit the plastic overhead and actually snapped and broke it, and the oxygen masks came down, and a lot of panic," the passenger, Michael Bailey, told Hawaii News Now.
The turbulence happened at 36,000 feet (10,973 meters) about 600 miles (966 kilometers) southwest of Honolulu, said US Federal Aviation Administration spokesman Ian Gregor.
The Boeing 777-200 was carrying 269 passengers and 15 crew members, according to Air Canada spokesman Peter Fitzpatrick.
Air Canada was arranging hotel accommodations and meals in Honolulu and options for resuming the flight.
"If we're going to be stuck somewhere, I can think of worse places," said Beam, travelling with her 10 and 11-year-old children.
A case of severe turbulence in June on a flight from Kosovo to France was captured on video, showing a flight attendant hitting the ceiling and another praying.
In another case, 29 people were injured after a Turkish Airlines flight encountered severe turbulence on its approach to New York's John F. Kennedy International Airport in March.
(With inputs from PTI and Reuters)
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