Chris Roberts of One World Labs in Denver was flying on the plane at the time it turned sideways, according to an FBI search warrant filed in April.

The warrant was first publicized on Friday by APTN, a Canadian News Service.

Roberts told the FBI he had hacked into planes “15 to 20 times,” according to court documents first made public Friday.

Roberts first made news in April when he was told he couldn’t fly on United Airlines because of tweets he had made about whether he could hack into the flight’s onboard computer settings.