A good write up of the incident on the BBC web site, including quotes from experts echoing my thoughts on the events and also includes comments from readers at the end (which I found interesting too) :
http://news.bbc.co.uk/2/hi/uk_news/magazine/5270500.stm
Some quotes for the lazy:
A passenger on the flight, Heath Schofield, explained the suspicions. "It was a return holiday flight, full of people in flip-flops and shorts. There were just two people in the whole crowd who looked like they didn't belong there."
Were these legitimate fears or is this group hysteria? How did not wearing flip-flops become a danger sign?
"What's happening informally is that people are applying their own version of terrorist profiling," says psychologist Gary Fitzgibbon.
"It's filtered down to the public that anyone who looks like a Muslim is potentially a terrorist. And what happens in groups is that you get people saying that somebody fits the profile."
...
Once the group has identified somebody as behaving strangely, this can then become self-fulfilling, says Dr Fitzgibbon.
"There's the 'audience effect', which means that if people are aware that they're being looked at, their behaviour can become awkward and self-conscious."
...
Some comments:
Fred: presumably these two gentlemen dressed in warm clothing were the only ones on the flight intelligent enough to check the weather forecast for Manchester before they boarded the plane.
Lyndon Rosser, Cardiff
All passengers have to go through really rigorous checks before boarding. To summarily decide that these checks are somehow invalid is to introduce an anarchy based on prejudice. The logical conclusion is to do away with all official boarding checks and let passengers check each other. Now that would make air travel interesting...
Tim, Sapporo, Japan