Arnold Schwarzenegger was among the worried passengers caught in the middle of the air on a British Airways plane.
The Terminator star – keyword "I'll be back" – was pushed back to London after an engine problem.
Flight BA269 from Heathrow to Los Angeles made a turn off the west coast of Scotland and dropped more than a thousand feet on Tuesday.
The Airbus A380-841 with 328 passengers and 26 crew on board took off at 4.07 and should have arrived in LA about ten hours later.
However, it declared an "emergency" and began to return to Heathrow shortly after passing the Western Isles of Scotland.
The plane circled Heathrow for more than an hour, with its speed varying between 180 and 300 knots every four minutes.
It was too hard to land immediately and had to drain fuel to land safely.
Movie legend Arnie and most of the other passengers stayed in airport hotels overnight before flying on US flights.
The 71-year-old star and former governor of California is "shaken but impressed by the professional BA crew".
On Monday night, the Austrians had taken a breather from politics – posted videos calling for fans to vote in the US midterms – and spent an evening in London.
He was discovered when he showed an enthusiastic thumb in front of a bunch of fans outside Annabels, a posh club.
Dressed in a tailored blue blazer, the Twins Star made a sophisticated figure.
The movie legend Arnie posted on Instagram said he got into Christmas shopping early.
His slogan "I'll be back" comes from the 1984 founded sci-fi classic The Terminator.
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British Airways told The Sun, "We apologize for delaying our customers' travel plans.
"The flight returns to Heathrow due to a minor technical problem.
"Safety is always our top priority and our well-trained flight crew will always play it safe."