ATLANTA - Atlanta-based Delta Air Lines said it will comply with the Federal Aviation Administration order to reduce flights at 40 major U.S. airports beginning Friday.

What we know:

As of 8:45 a.m. Thursday, the exact airport where the reductions will take place has not been released, but it is expected to include the world's busiest airport, and Delta's largest hub, Hartsfield-Jackson Atlanta International Airport.

Delta said it expects the "vast majority" of its flights to operate as scheduled, but Delta said it will work with customers who are affected by delays or cancellations.

The airline also said it's providing extra flexibility for customers to change, cancel or refund flights without penalty while the reductions re in place — even if the tickets don't normally allow that.

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