Originally Posted by PTravel

Planes are not public, which means the airline can prohibit filming. However, that prohibition is by way of license, which is to say contract. If you breach the contract, the airline's remedy is limited to withholding its consideration for the contract, i.e. passage on the flight. In plain English, if the airline has a rule against photography and you violate it, it's sole remedy is to ask you to leave the plane. They can insist that you delete photos in exchange for staying on the plane, but they cannot "make" you delete photos, nor can they summon a policeman who can require that you do so. This assumes no double-secret-probation, we-don't-have-to-tell-you secret law.