The new Singapore Airlines A340s that fly from LA and New York to Singapore nonstop are equipped with coffins.

Along similar lines, I suggest that aircraft flying within, to, or from the USA be equipped with the following:
- A detention cell capable of holding multiple offenders
- A flying courtroom with selected passengers called for "jury duty"
- An electric chair

One of the advantages would be a constant "change of venue" and mandatory sequestering of jurors.