traffic control gave the pilot permission to climb but reversed its decision denying the request minutes later the plane disappeared from radar. i think he got into a thunderstorm that few planes have gotten into and out of. i could be wrong on that but there were vie p lent thunderstorms in that area. he ran into severe turbulence that happens all of the time. literally all of the time. so he requested a higher altitude or a different course to get around or get over it. that is absolutely normal in these kinds of situations. what s not normal is not to hear from him again. there have been several weather related crashes within the past decade including a trance asia airways l 72 that crashed earlier this year during landing trying to avoid a thunderstorm. flight 204 crashed in august during landing due to heavy rain