| CPC B64C 1/1469 (2013.01) [B64D 45/0028 (2019.08)] | 20 Claims | 

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               1. A barrier door to control movement of persons through an opening within a cabin area of an aircraft, the barrier door comprising: 
            a body comprising an upper side, a lower side, and lateral sides; 
                a lock connected to the body, the lock comprising: 
              a cylinder with an elongated shape comprising an inner end and an outer end, the cylinder further comprising an interior space that is hollow; 
                  a pin positioned within the interior space of the cylinder and movable between a disengaged position with a distal end retracted within the interior space and an engaged position with the distal end extending outward beyond the outer end of the cylinder; 
                  a biasing member that biases the pin towards the engaged position; and 
                  a release mechanism threaded to the inner end of the cylinder, the release mechanism rotatable relative to the cylinder to adjust a position of the cylinder and pin relative to the body. 
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