A drunk woman onboard a TAP Air flight just really wanted a Pepsi.

The unidentified Spanish woman became belligerent after boarding the March 9 Malaga-bound flight in Lisbon, Portugal, witnesses reportedly told Daily Mail.

According to outlet, shortly after the woman boarded the hour-and-a-half flight, she began taking shots from a hip flask while demanding crew serve her a Pepsi. When attendants informed her they would only be serving fruit juice on the flight, she became outraged and began screaming at crew in Spanish.

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“She was getting out of her seat, her face was bright red,” a male passenger on the same flight told the Daily Mail. “Her hands had turned into claws. She looked like a demon. She was the worst passenger I have ever seen on an airline and I fly quite a lot.”

The man claimed to the Daily Mail that others on the flight said the woman had been drunk before she boarded, and continued to drink throughout the flight.

“We were all like why is she so insistent on [the Pepsi], but it turned out it was because she wanted to mix it,” he said. “She was the last one to board, everyone was waiting and she was at the front of the plane.”

The man went on to say that after boarding late, the woman – who reportedly had trouble standing on her own because she was so inebriated – got into an argument with a flight attendant about putting her bag in the cargo hold.

“Stewardesses were telling her you have to put it away but she was like 'no.' She started speaking English and said 'I have my books, I have my jewelry, I have my money in there — I need my bag.”

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Things continued to escalate, with the woman having a full-on meltdown during the flight when denied her mixer of choice: the Pepsi.

“But this lady was out of control, she was drunk, she was aggressive, she was abusive, she was chucking food, she wanted her bag, she wasn't taking any notice of airline safety procedures and she just got let on [the flight].”

“She started screaming more. She was jibbering that her house was in Spain and that she was Spanish,” he added.

The TAP Air flight was met with police upon landing and the woman, who officers reportedly labeled a “banshee,” was detained. The captain of the flight also reportedly told the woman she was permanently banned from flying TAP Air.

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TAP Air did not immediately respond to Fox News’ request for comment.