This is pretty much every guy's fantasy when they're flying solo. So of course it ends in disaster in REAL life. A British girl in her 20s was flying with her parents from London to Las Vegas last week, on a Virgin Atlantic flight. And she got DRUNK. Then she started talking to the random guy sitting next to her . . . and even though they just met, they decided to join the MILE-HIGH CLUB in the bathroom. Unfortunately, their bathroom sex got LOUD . . . and flight attendants went to the bathroom to break it up. Then the woman got into a loud argument with the flight attendants . . . so they ended up CUFFING her. And when the plane landed, the cops escorted her off. Fortunately, the Las Vegas police were pretty cool about the entire thing . . . and just let her off with a warning. There's no word how her parents felt about what went down. We assume they were thrilled.