Might be related to this, "For airplanes having a seating capacity of more than 44 passengers, it must be shown that the maximum seating capacity, including the

Might be related to this, "For airplanes having a seating capacity of more than 44 passengers, it must be shown that the maximum seating capacity, including the number of crewmembers required by the operating rules for which certification is requested, can be evacuated from the airplane to the ground under simulated emergency conditions within 90 seconds." [1] [1] https://www.law.cornell.edu/cfr/text/14/25.803 https://www.law.cornell.edu/cfr/text/14/25.803