Apparently American Airlines is performing an evacuation test on their Airbus A321neo, which is required before they’re certified to fly it in revenue operations.
There’s controversy over whether today’s more densely packed planes — more seats, closer together, with higher load factors — can be evacuated that quickly under real world conditions, but I’ve argued that misses the point. Evacuation standards need to be so stringent in order to account for the delays that happen when frightened passengers actually leave the aircraft in real world stress.