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Chris Roberts, a Colorado-based aircraft security systems expert, took to Twitter to nudge United Airlines about what he believes is a weakness in its security systems. He tweeted from on board a United flight on Wednesday read: “Find myself on a 737/800, lets see Box-IFE-ICE-SATCOM, ? Shall we start playing with EICAS messages? “PASS OXYGEN ON” Anyone ? :)”

One World Labs, the company he works for, have for some time nagged Airbus and Boeing about their concern of how easy it allegedly is to connect a laptop to a box beneath an airline seat and witness many of the plane’s systems in action. Roberts was pulled from the plane, questioned and had all his computer gear taken from him.