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today. happening right now, the ntsb investigators are on the scene in ohio at oaf norfolk southern train wrecked in the state. the ntsb says no hazardous materials were released in that wreck after 28 train cars derailed in springfield on saturday. it prompted shelter in place orders for residents. it comes a month after the norfolk southern state crash in east palestine, ohio. crews are still working to remove that contaminated soil and liquid from the site. jason carroll is? springfield now. jason, what are you learning now about this latest crash in. >> reporter: the ntsb is plan...

Before, it's the air traffic controllers, and the faa administrator who has to start these standards for how many can take off and how quickly. when it looks like good with math, you do it mathematically and i try to figure out how many flight you can get out of an airport, those are real numbers, but things have to delay. the one in austin, it was supposed to have taken off, but took longer than usual to go through the preflight and that sort of thing. so the air traffic controller thought he had already left, but hadn't. those are other situations you have to create a buffer for. >> clearly ...