There are multiple liquid chemicals that appear clear and odorless like water that can be detonated through striking them or by mixing them with water or other clear odorless chemicals, or worse they can form toxic gasses that will kill everyone onboard a plane. The drinks brought in by flight staff are basically directly from the manufacturer and sealed with a temper evident method. Making it harder to smuggle anything into a plane that wasn’t bottled as is in the factory.
So it’s simply a method to prevent a terrorist attack. But no, private planes are not subject to the same passenger scrutiny as larger commercial ones. TSA regulations exempt planes under a certain max passenger amount from requiring their passengers to be screened by the TSA.
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