How about the following compromise. He is shackled while in US airspace.
Or drop him out of the plane at 20,000 feet.
how about this compromise. They shackle him while he's breathing that way if he doesn't want to be shackled all he has to do is stop breathing.
The way I read this, they don't want him getting off the plane in some third county at a re-fueling stop. If that happened, there might not be a legal basis for forcing him back onto the plane, and he might escape whatever justice is waiting for him back home. I could be wrong. If this is the concern, then he should be shackled until after the last refueling stop -- or he should be on a military aircraft that can be refueled in flight.