Delta grounds flights due to systems problems

FILE - In this April 14, 2015, file photo, Delta Air Lines passengers watch as a Delta plane taxis at Atlanta's Hartsfield International Airport in Atlanta. Delta Air Lines grounded flights scheduled to leave Monday, Aug. 8, 2016, after experiencing unspecified systems issues. Confirmation of the troubles came in an official account that responds to customers via Twitter. The airline declined to immediately comment by phone and it was unclear whether all its flights were affected. (AP Photo/Charles Rex Arbogast, File) (The Associated Press)

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Passengers in the Delta Airlines boarding area at McCarran International Airport in Las Vegas are jammed in to wait as Delta Airlines says all its flights are grounded due to a system outage, Monday, Aug. 8, 2016. Delta Air Lines says it is has grounded flights after experiencing unspecified systems issues. (AP Photo/Bree Fowler) (The Associated Press)

Delta planes are parked at gates at Atlanta's Hartsfield International Airport in Atlanta, Monday, Aug. 8, 2016, as Delta Air Lines grounded all flights after after a power outage hit its computer systems globally. (AP Photo/Branden Camp) (The Associated Press)

LONDON – Delta Airlines says it is has grounded flights after experiencing unspecified systems issues.

Confirmation of the troubles Monday came in tweets to its customers. The airline declined to immediately comment.

A typical response to Delta's customers complaining about their service was: "Our systems are down everywhere. Hopefully it won't be much longer."