A jet sustained significant damage when it rolled off a taxiway at the world's busiest airport in Atlanta Tuesday morning.
Delta Air Lines spokesman Eric Torbenson told The Associated Press mechanics were testing the engines of the Boeing 737 when they experienced a problem with the braking system around 5 a.m.
Federal Aviation Administration spokeswoman Kathleen Bergen said there were no passengers aboard the aircraft and no injuries were reported.
Bergen said the jet rolled off the taxiway on the east side of Hartsfield-Jackson Atlanta International Airport.
Torbenson said the jet sustained "significant damage."
Delta spokesman Anthony Black said the jet would be taken to a maintenance facility for a full structural investigation.