What is great fun is having the guys start flying the line much as if they were in a horizontal "freefall"...and in time they can swing well out beside the aircraft and wave at you...first on one side...then the other. What is even more fun is seeing how quickly they settle down when you dump the collective momentarily.
http://281stahc-assn.org/281history/recondo/equip.html
Some info about the McGuire and Stabo rig that led to the current method.