Yes, there is a death penalty. It comes with almost limitless appeals and all the lawyers a guy can desire, and so, it means there is considerable time and enormous costs passed on to the taxpayer before the buggers get executed. I'd prefer to go the low-cost way and deport, letting their home countries take care of them in their own creative ways. Or better yet, we could simply lose them some 45,000 feet over the Atlantic ocean and report a cargo door malfuntion. {Oops- he must have slipped!}
Or like all other jobs, you can outsource the trial to India.......we have a special affinity for members of the Lashkar-e-Taiba.