United Airlines grounded all flights worldwide Wednesday morning after its computer system suffered a technical glitch, causing a ripple effect of heavy delays throughout major airports. About 3,500 flights were being affected. The delays could reach 235 domestic and 138 international destinations. "We experienced a network connectivity issue this morning," United confirmed in a statement after 9 a.m. "We are working to resolve this and apologize to our customers for any inconvenience." The Federal Aviation Administration specifically blamed the ground stop on "automation issues." The ground stop, however, was lifted for United's regional carriers, which can perform their own weight...