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A United Airlines system failure grounded flights across the country for about two hours Wednesday morning, including in Denver, leaving travelers frustrated and waiting in long customer service lines.
United blamed the "network connectivity issue" on a router problem.
"An issue with a router degraded network connectivity for various applications, causing this morning's operational disruption," said spokeswoman Jennifer Dohm in an e-mailed statement. "We fixed the router issue, which is enabling us to restore normal functions."
Earlier Wednesday, the Federal Aviation Administration said an "automation" issue had caused the grounding.
DIA United Airlines lines
Travelers lined up at the United Airlines check-in kiosks at Denver International Airport on Wednesday, July 8, 2015. (Andy Cross, The Denver Post)
Top U.S. law enforcement and security officials said they didn't see a link with the outage at the New York Stock Exchange and the temporary malfunction of the Wall Street Journal's website, The Associated Press reported.
The failure caused widespread delays on United flights at Denver International Airport, which serves as a hub for the carrier. Airport officials on Wednesday were encouraging travelers to arrive early and give themselves plenty of time.
United canceled four mainline flights and 55 of its United Express flights nationwide, Dohm said. More than 800 flights were delayed, she said.
The airline offering travelers vouchers through a form on its website.
Even after the FAA lifted the ground-stop order, allowing United planes to fly again, significant logistical issues continued.
"Obviously, it sends a ripple effect through the entire airspace systems," said Jeffrey Price, an aviation security expert and professor of aviation at Metropolitan State University of Denver.
It becomes a massive rebooking effort, he said.
"Behind the scenes, you've got the airlines paying each other to fly their passengers," Price said. "Even just a few hours will cost millions of dollars for the airline. The whole system is dependent upon the fact that this things works."
FAA clearances and flight plans are thrown out the window, and it could take hours for normal patterns and operations to resume, he said. Passengers displaced by delays or cancellations sometimes have to fall later the queue or be booked on other airlines as carriers and the FAA move to get to normalcy, he said.
At the terminal level, airports have to shift into a form of emergency operations to handle the thousands of patrons who are waiting for flights, he said.
from : http://www.denverpost.com/news/ci_28451322/united-airlines-system-failure-prompts-denver-airport-urge
