updraft. this wing will be pushed up violently and instantly and the plane will tilt to the left. reporter: on commercial flights, flight attendants that are up and about suffer 78% of the injuries. the skies have definitely gotten more turbulent. and during the course of my 26-year career, turbulence was always the biggest threat on the job. i will say seat belts, seat belts, seat belts. that is the most important part of this. reporter: tom costello, nbc news. we have a lot to cover in our second hour of chris jansing reports. let s get right to it. at this hour, demanding answers. we re moments away from an all-senators briefing on the biggest classified documents leak in a decade what lawmakers want to know. inside a key moment from the january 6th insurrection that one proud boys leader says he can t recall details of that testimony on the stand and under oath and 30 minutes from now, the man accused of shooting ralph yarl will be arraigned charged with
them coming up plus, ron desantis bid to make a splash in washington barely made a ripple now with red flags for the campaign piling up the governor heads to south carolina but the poll just as tough by donald trump beating him by 20 points and fox news is on the hook for that $800 million settlement no question, it s a hit to their bottom line, but will it change the way they do business but, we start with this, in a country where guns outnumber people, a sickening pattern is emerging more americans doing what we all do all the time, going to the wrong house, getting lost on the road opening the wrong car door making simple mistakes but now, getting shot over them it happened again early tuesday morning in texas when a houston area teenager traveling with members of her cheer squad thought she was getting into her own car before realizing it was someone else s, she tried to walk away, but it was too late i was trying to apologize to him for accidently getting to the
complete lost of control. reporter: so-called clear air turbulence has only gotten more severe over the decades. it is increasing, and it is because of climate change. so we know that the wind sheer in the jet stream is now 15% stronger than it was when satellites first began observing it in the 1970s. reporter: researcher paul williams predicts turbulence will get two to three times worse in the years to come affecting flights at hig altitudes in the northern hemisphere there has been no notable increased in the jet stream winds, but what we are seeing is the differentiating in height, that s when you get the clear air turbulence it is invisible to radar most pilots rely on fellow pilots reports to know where it is imagine the air flow over this wing experiencing a sudden