It is an utterly crazy and poorly thought proposal by the TSA -
TSA: TSA Proposes Large Aircraft Security Program
To give you an example, everyone carried on an aircraft with MTOW of 12,500lbs or more must go through a full background check and the TSA must be notified. This is the same, regardless of whether you are carrying the same old folk on the same old routes for a Part 91 operator, or if you are NetJets or if you are any of the B17 operators who sell rides in their aircraft.
Imagine if the TSA gets their way, what next? The UK version of the TSA has a brainwave, decides thats a jolly good idea, and they should follow suite? The hassle the passengers and crew face daily with liquids & gels & nail clippers & removing shoes will be nothing in comparison to this. A line must be drawn between what is sensible necessity and ill-thought out overkill.
NBAA, AOPA & EAA are all fighting this daft plan, and everyone is encouraged to go online to voice their protest against it. This is just one example...
AOPA Online: TSA Large Aircraft Security Program Member Action Center