A dog died on a United Airlines flight from Houston to New York after a flight attendant ordered the animal's owner to place the dog inside the plane's overhead compartment bin.
Witnesses say a flight attendant forced the owner to put the French bull dog into overhead storage, even though the passenger refused.
The flight attendant later claimed she didn't know a dog was inside of the carrier.
United issued a statement calling the death a "tragic accident."
Last April, United made headlines after a video surfaced of a doctor being violently removed and dragged from a flight for refusing to get off of the plane because there was no room.
Dr. Dao suffered a concussion, broken teeth and a broken nose as a result of the incident.
Three weeks later, a rabbit worth over $2,000 died on a flight to Chicago
In August, a flight from Houston was delayed for two hours due to weather and the air conditioning system malfunctioned, killing a dog in the plane's cargo hold.
The U.S. Department of Transportation says 24 animals died on U.S. planes in 2017.
They say 18 of the deaths happened on United flights.