was not the work of hackers. the new york stock exchange calling it a technical issue, united airlines blaming a faulty router. with the confluence of tech failures in one day one hours of each other, a bizarre coincidence, to say the least. . for nearly four hours, the new york stock exchange was at a halt. a technical computer glitch forcing the suspension of trades on the big board. it's unclear this hour how much money may have been lost but in the end, the dow was down over 200 points. in the travel world, from california to chicago, a backlog of passengers stuck on long airport lines, while all of united airlines' flights were grounded. >> well they have a systemwide ground stop due to a computer outage. >> reporter: a systemwide failure shut down operations for the major u.s. carrier for hours as well.