A 2008 study that surveyed 5,000 flyers found that one in every 50 people said they met the love of their life on a flight.
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The plane crush can serve a function - it can make flying less miserable. It can help you cope with probably the worst part of travelling.
Even the plane's design can lend itself to flirtatious imaginings. The small seats and little leg room can be oddly romantic. Researchers found that when people are in anxiety-inducing situations, they may misattribute the feeling of nerves for attraction. It makes it then not unusual to believe you could meet someone you like on a plane.
The first scheduled passenger airline service took off on Jan 1, 1914. Thomas Benoist designed the "flying boat", the pilot was Tony Jannus, and Abram C. Pheil was the first paying passenger.
The 21-mile (34-kilometre) flight took 23 minutes, flying from St. Petersburg to Tampa, Fla. The plane flew no higher than 50 feet (15.2 m) over the water. Halfway, the engine misfired, and Jannus touched down in the bay, made adjustments and took off again. When the plane landed, they were swarmed by a cheering crowd of about 3,500.
If you're in a plane and steering around a circle, the centripetal force comes from leaning into a curve, just like a cyclist leans into a bend.
Steering involves banking, where the plane tilts to one side causing the one wing to dip. The plane's overall lift is tilted at an angle, making some of the lift act sideways. This sideways part of the lift provides the centripetal force that makes the plane go around in a circle. But turning the plane in a circle will make it lose lift and altitude, unless the pilot uses the elevators to increase the angle of attack to cause lift again.