What happened
While operating under air traffic control instructions, Delta Airlines flight 1823, a Boeing 737-800, was positioned on taxiway D-1 holding short of runway 27. Simultaneously, American Airlines flight 1547, a Boeing 767-200, was instructed to taxi to runway 27 via taxiway D.
The crew of the Delta 737 reported that the aircraft was stationary at the runway 27 hold line with the parking brakes engaged when they experienced a "violent shudder." Upon looking back, the crew observed the American Airlines aircraft taxiing past them on taxiway D. During this movement, the right wing tip of the Boeing 767 struck the left elevator and horizontal stabilizer of the Boeing 737, causing substantial damage to those components.
The flight crew of the American 767 noted that sun glare was affecting visibility through the windscreen. However, they had observed the Delta aircraft holding short, and the captain believed there was sufficient clearance to proceed with the taxi.