From reports today in The New York Times, stunt aerial actors using harnesses (mechanics, I assume) must first be vocally certified as being properly rigged and attached to the lifelines by two or three stage staffers, and they themselves must give a thumbs up before the stage manager can authorize each flight.
They have also been given the authority to arbitrarily and suddenly stop the show if they sense rigging problems or danger in the air.
In a two-hour cast meeting at which director Julie Taymor took questions, a "demoralized" company questioned why they had not been give more tech rehearsals.
A Times editorial questioned the unconventionally complex production, expressing a degree of apprehension that it may not be suitable for the stage. "....this production may represent the point at which legitimate theater lumbers into terrain that belongs to the circus."
Show was reported ready to resume performances as of tonight.