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An anonymous NFL player says he was sexually assaulted on a United Airlines plane and claims flight attendants didn't do much to stop it -- and now, he's suing.

The player -- using the alias "John Doe 1" in the new lawsuit obtained by TMZ Sports -- says on Feb. 10, 2020 ... a woman "sexually harassed, assaulted, abused, and violated" him during a flight.

The unidentified footballer says the trip -- a cross-country, red-eye ride from LAX to New Jersey -- was a complete nightmare ... and it was all made worse by United staffers.

In the suit, the man says he took his place in a middle seat ... and when a woman sat in the window seat next to him -- he claims he was immediately harassed over the safety mask he was wearing.

The football player says he told her it was because of the growing coronavirus pandemic ... but claims the woman hit and elbowed him and demanded he move seats nonetheless.

The man says he and his friend, identified as "John Doe 2" in the suit, observed the woman taking pills -- and believed her to be under the influence.

In the suit, the NFL player claims Doe 2 got up to tell flight attendants about the woman harassing Doe 1 ... but says they did nothing about it.

The NFL player claims the woman then sexually assaulted him ... groping and massaging his knees and thighs. He claims Doe 2 got up again to inform flight attendants, but says they still did nothing.

In the suit, the NFLer claims the woman began to "intensify" her sexual assault, "grabbing and groping his quads and then stroking her hand across his lap towards the inside of his leg near his

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