LONDON // Delta Airlines has grounded flights scheduled to leave on Monday after experiencing unspecified systems issues. Flights scheduled for departure were not taking off, but those already in the air were operating normally, Delta said in a statement. The outage was affecting flights globally, a London-based spokeswoman for the airline said. Confirmation of Monday’s troubles came in an official account that responds to customers via Twitter. “Delta has experienced a computer outage that has affected flights scheduled for this morning,” the company tweeted to customers affected by delays. “Flights awaiting departure are currently delayed. Flights enroute are operating normally. We appreciate your patience.” The company said its IT systems were down everywhere and “hopefully it won’t be much longer.” Several applications were affected, including the company’s website. Delta operates 5,000 departures a day and is a member of the SkyTeam alliance alongside airlines including Air France-KLM. * Agencies