Air Mail Mystery 1932 (ep04) Tear Gas

12 action packed episodes. Episode 7 is missing.
Early air mail flight was dangerous and its pilots needed to have a considerable amount of daredevil in them to brave the risks. These pioneers exhibited extraordinary bravery or were merely doing their job, the careers of the members of this "suicide club" were like those of few others.
One company, Trans American, delivered mail for the government and for some reason, their planes were literally falling from the sky.
Is it sabotage??? Or just plain bad luck??? Tune in to Air Mail Mystery to find out.