A person would need to be able to lift nearly 20,000 pounds to open an average emergency plane exit mid-flight. According to the Federal Aviation Administration, the exit doors are built to only open on the ground.
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They are usually left locked throughout the flight. Cockpit security systems are supposed to allow a pilot the ability to access the cockpit. But access can be deliberately denied from within the cockpit.
The program is conducted by specially trained undercover armed RCMP officers (known as aircraft protective officers – APOs) on selected domestic and international flights and all flights to Ronald Reagan Washington National Airport, in the United States.
Basically, the air pressure inside the cabin is higher than it is outside of the plane to enable the people onboard to breathe normally. That's why, if a window happens to break, the air inside would escape at high speeds, taking small objects like phones or magazines (or sometimes larger things, like people) with it.
The heavier and faster the bird is, the more potential damage there is to the aircraft. Bird strikes almost always damage the forward-facing areas of the aircraft - the windscreen, nose cone, and engines. Bird strikes to the nose cone can cause dramatic damage, but rarely present a reason for the flight to be aborted.
They sit on their hands during take off and landing so that if there is any turbulence they are already braced and ready for it. So, it's basically just for safety.
1. The flight crew wanted to keep the plane dark. Airlines will often ask passengers to close window shades during night flights as a favor to those who wish to sleep. Even during the daytime, many fliers enjoy a darkened cabin so they can better see the screens on their laptops, tablets or in-seat monitors.
At the entrance, flight attendants can also get a close look at boarding passengers and what they are carrying. For example, if someone wants to bring an oversized piece of hand luggage onto the plane that was not noticed at the gate, there is still the option of having it checked in.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint.These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.