A cloud of uncertainty has stranded trans-Atlantic celebrities.

Following the eruption of the Icelandic volcano Eyjafjallajökull - whose mountainous black plumes of ash, silica and other particulates quickly spread over much of Western Europe, closing airports and grounding flights for days - earthbound matters such as concerts and movie premieres have gotten delayed. Or in some intrepid cases, not.

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"Iron Man 2" was one victim, according to The Associated Press, which reported that the superhero movie's April 26 world premiere had to be moved from London to Los Angeles. The British premiere of "The Last Song," scheduled for Tuesday will have to go on without star Miley Cyrus. Singer Usher has had to postpone promoting his new album in Europe.

Going the opposite direction, the American funk/soul band Sharon Jones & the Dap-Kings were stuck overseas during a European tour and unable to perform on last night's "Late Show with David Letterman."

Organizers of the Tribeca Film Festival were trying to reroute those with canceled flights and making contingency plans, a spokeswoman told the AP.

Monday night's televised WWE match at New Jersey's Izod Arena featured its Smackdown wrestlers rather than the scheduled Raw grapplers, who were stranded in the United Kingdom.

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And now for something completely different: British actor-comedian John Cleese was finding his way back to London from Oslo via Brussels - in a taxi. Caught in the Norwegian capital after a TV appearance, the onetime Monty Python member told Norway's TV2, "We checked every option, but there were no boats and no train tickets available. That's when my fabulous assistant determined the easiest thing would be to take a taxi." The roughly $5,100, 943-mile ride to Brussels, from where he planned to take a Eurostar train to London, was scheduled to take 15 hours.