Passengers on a plane locked a crying toddler in a bathroom. The airline said her grandma gave them permission.

• Two passengers locked a crying toddler inside an airplane bathroom on a flight in China.
• The incident, filmed and shared on Chinese social media, has sparked intense online backlash.
• Juneyao Airlines said the child's grandparents permitted the strangers to "educate her."

Two passengers aboard a Juneyao Airlines flight from Guiyang in southwestern China to Shanghai on Saturday locked a crying toddler in an airplane bathroom.