United Airlines requests ground stop at major airports

And we are following some breaking news right now. United Airlines has apparently requested a ground stop at major airports tonight. We're talking Chicago, Newark, Houston, San Francisco.We have NBC News senior producer Jay Blackman on the phone. Jay, what are you hearing about why this ground stop was ordered. >> So Gotti, this is affecting all of United's mainline flights.So not their regional characters, not their regional flights. It's uh an issue with a computer system. They're saying it's due to a tec ...