they actually reduced sky marshall presence on airplanes a long while ago, they were causing more issues than they were worth:
Federal Air Marshal Service - Wikipedia, the free encyclopedia
Problems run rampant through Federal Air Marshal program: reportĀ* - NY Daily News
Air Marshals: Undercover and Under Arrest - ProPublica
Report on Federal Air Marshal Service paints an unflattering picture - CNN.com
so those people trying to protect us with their guns on planes are instead using their badges to smuggle cocaine and explosives (and child porn). that sure makes me feel safer!