A Delta flight attendant prevented a Georgia doctor from singing the national anthem in honor of a fallen soldier whose body was being carried on the flight, according to a video by the doctor that has been making the rounds on Facebook.

Delta Air Lines said in a statement sent to The Times on Tuesday that it had contacted the passenger and was looking into what happened. The airline said it did not have a policy regarding the singing of the national anthem on its planes.

The passenger, Dr. Pamela Gaudry, an obstetrician from Savannah, Ga., made the video directly after the flight landed in Atlanta, saying she hoped that it would attract attention and even reach President Trump.

Dr. Gaudry, who said she was the wife of a Navy captain who died in the line of duty, said in the video that not singing was “the most uncourageous thing” she had done in her life.