![](https://www.historynet.com/wp-content/uploads/2021/09/COOPER-air-stairs-960_640.jpg)
Cooper chose one of two military-style backpack parachutes for his jump from the 727; he harvested nylon risers from this sport parachute to secure the ransom money to his body; he exited the 727 from the airliner’s extended aft airstair. (Boeing via John Frederickson)