assuming TLS isn't broken and E2E is working as intended...
isn't it more likely that someone saw the message while looking over their shoulder, was reasonably worried and alerted a security officer: "hey someone over there is messaging about harming the plane", and then things got muddled from there about technology?
even going past a ceiling camera pointing down straight at you writing a message would probably give enough resolution to see an emoji.... but it's not like airport security wants to reveal their abilities
isn't it more likely that someone saw the message while looking over their shoulder, was reasonably worried and alerted a security officer: "hey someone over there is messaging about harming the plane", and then things got muddled from there about technology?
even going past a ceiling camera pointing down straight at you writing a message would probably give enough resolution to see an emoji.... but it's not like airport security wants to reveal their abilities