One question about the sentencing thing, getting a heavier sentence if injury is caused, isn't this often due to a different offence having been committed. For instance 'causing death by dangerous driving' is a different charge (and more serious offence) to a simple 'dangerous driving'. And in the case of the pilots if they had crashed due to the excess alcohol, killing someone in the process, I would assume that they would then face murder, or at least manslaughter, charges in addition to the 'over the limit' charges?
(And I definitely don't know if there is a diferent charge for causing injury while drunk driving to simply being over the limit).