MercoPress. South Atlantic News Agency

All United Airlines grounded for almost two hours because of computer problems

”We are restoring regular flight operations, but some customers may experience residual delays (Wednesday),” United said in an afternoon statement.

All United Airlines flights were grounded for almost two hours early Wednesday due to a computer hardware problem, creating travel headaches for tens of thousands of passengers that stretched into the afternoon. United said 800 flights had been delayed, with four flights canceled on its main carrier and 55 on its regional partners. A similar situation happened on 2 June when United flights were also grounded due to “automation issues.”

 ”We are restoring regular flight operations, but some customers may experience residual delays (Wednesday),“ United said in an afternoon statement.

The U.S. Federal Aviation Administration said all flights operated by United, the fourth largest U.S. passenger carrier, were grounded starting at about 8 a.m. EDT after the airline experienced a system-wide computer problem. Some travelers were forced to look for alternative flights and connections before the order was lifted 9:47 a.m.

”An issue with a (computer) router degraded network connectivity for various applications, causing this morning's operational disruption,“ United said in a statement. ”We fixed the router issue, which is enabling us to restore normal functions.“

United said it would rebook flights for affected passengers without charge.

A separate computer outage affected stock market trading Wednesday morning. The NYSE Group, which includes the New York Stock Exchange, suspended trading in all securities due to technical difficulties. Trading resumed shortly after 3 p.m. EDT.

U.S Senator Dianne Feinstein, the top Democrat on the Senate Intelligence Committee, said she had not yet been briefed on the two major outages. She told reporters: ”This is not an oddity. This is going to continue to happen and we have to begin to deal with it ... and we have to deal with it legislatively.”

Aviation industry consultant Robert Mann said technical disruptions have been on the rise since airlines began automating more of their operations and since they switched from private, proprietary communications for flight operations to Internet-based communication, which is cheaper but exposes the carriers to more risks.

Technical disruptions “are nagging problems, but these are not problems that are going to draw the huge capital investment necessary to (approach) 100% reliability,” Mann said. “The revenue loss in these cases is relatively modest.”

United flights were also grounded on June 2 due to “automation issues.”