American Airlines has said an employee has been "removed from duty" after a clash with passengers in a row over a baby's pram in San Francisco.
A passenger had uploaded a video of the aftermath of the incident, saying a mother had been struck with the pram as it had been forcibly removed by the employee in question.
The video records the employee saying: "Hit me! Come on, bring it on", when challenged about the incident by another passenger.
American Airlines said in a statement:
We are deeply sorry for the pain we have caused this passenger and her family and to any other customers affected by the incident.
We are making sure all of her family's needs are being met while she is in our care.
After electing to take another flight, we are taking special care of her and her family and upgrading them to first class for the remainder of their international trip.
It has started an investigation to obtain the facts and said it was "disappointed by these actions" of the staff member, who has been "removed from duty while we immediately investigate this incident".
The incident took place at San Francisco International Airport as flight 591 prepared to take off for Dallas.
Passenger Surain Adyanthaya posted the video to Facebook and said that before the footage, the employee had "violently" taken the pram from the mother, hitting her and "just missing the baby".
It comes after United Airlines made the headlines earlier this month, when a video on one of its flights recorded a passenger being dragged from the plane after it had been overbooked.
The airline has faced criticism for its handling of the incident and the aftermath, with the carrier's boss Oscar Munoz initially appearing to place the blame on the passenger, calling him "disruptive and belligerent", before later apologising.