(NBC News) — A federal lawsuit was filed against Delta Air Lines on Tuesday accusing flight attendants of failing to intervene after a male passenger, according to the lawsuit, was served at least 10 alcoholic drinks and then groped a mother and her 16-year-old daughter.

The plaintiff in the suit, filed in the Eastern District of New York, was identified only as the parent of the teenager. According to the filing, the girl and her mother were traveling to Athens, Greece, from New York City on a nearly nine-hour flight last year when the incident occurred.

A woman who was assigned the seat next to her daughter, who was in the middle, switched with an unidentified man in order to sit next to her husband, the suit said. The family is referred to by initials throughout, with “N.A.” referring to the girl while her mother is identified as “A.A.”

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