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Dallas airports are back to normal after FAA details the problem that caused the outage

Flight operations returned to normal at two Dallas area airports on Saturday after the Federal Aviation Administration revealed that a Verizon Communications unit had suffered telecom failures which caused more than 2,000 flights to be disrupted.

American Airlines, Dallas Fort Worth Airport's largest carrier, reported that more than 100,000 passengers had been affected by telecom problems which began around 2 pm CT on Friday and continued until the morning of Saturday.

American Airlines said that it had to cancel 530 flights on Friday and 160 flights on Saturday. It also had to divert 65 other flights bound for Dallas.

Southwest Airlines, Dallas Love Field's largest carrier, has delayed or cancelled more than 1,100 flights on Friday. Southwest Airlines reported 580 extreme delays Friday.

American Airlines, which has also experienced a delay of more than 350 flights in the last week, warned that there may be additional operational impact.

The FAA reported that "multiple failures of telecommunications services provided by Verizon Communications Frontier unit" led to the outage which affected the FAA's Dallas Terminal Radar Approach Control (which handles operations at both Dallas airports).

The FAA stated that the oversight by L3Harris contractor failed to ensure the redundancies of the system worked properly.

A Frontier spokesperson said that a third party contractor in Argyle (Texas) accidentally cut the fiber lines of their company, affecting communication systems at Dallas airports. She said that her team coordinated with the FAA, the airports, and worked over night to stabilize the system. As a result, the airports were back up and running by today.

American Airlines explains the events leading to flight disruptions. Two fiber optic cables were cut on Friday, affecting data that supports FAA radars and radio frequencies, as well as computer systems.

David Seymour (American Airlines' Chief Operating Officer) wrote in an email sent to its employees that the efforts of L3Harris, Frontier and other airlines to restore service were not moving fast enough. He also said that the airline was working on determining the financial impact.

Seymour, along with the airline's chief executive officer, Robert Isom had difficulty "reaching leaders at Frontier and L3Harris". "We are extremely disappointed that neither of the providers seems to be in a hurry to resolve this issue," Seymour wrote in an email.

L3Harris didn't immediately respond to an inquiry for comment.

In recent years, the FAA has been plagued by a series of technical issues that highlight the fragility of the U.S. Air Traffic Control System. Congress awarded $12.5 billion in July to revamp the system. (Reporting by David Shepardson, Lucia Mutikani and Leslie Adler; editing by Leslie Adler).

(source: Reuters)