The plush accommodations in first class are getting plusher while the cramped conditions in the cheapest seats are getting, well, more cramped. That's the trend in airlines, where there seems to be a shrinking "middle class" for passenger comfort, say experts. And it's because passengers themselves are polarizing. "Some are price sensitive, mainly interested in lowest ticket price, and the other group is service sensitive – they're not really looking at cheapest price, but for comfort and amenities," says Bijan Vasigh, a professor at the Business College at Embry-Riddle Aeronautical University.

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