Daylight - two hovering flat cylinders

At approximately 2:45 pm, two witnesses observed two long, flat like a coin, almost-rectangular objects. The objects appeared to have rounded corners. The sighting occurred while witnesses were in moving vehicle traveling approximately 50 to 60 mph. Photo/video could not safely be captured because vehicle was moving and the short length of sighting.
The objects appeared to be hovering above the south end of Alliance Airport, at least 400 yards above the ground. The objects were extremely bright, even in the sunny afternoon. The light was similar to sunlight reflecting off metal, except brighter. At that time of day, the sun was on the other side of the objects from the witnesses' perspective.
At first it appeared the objects were simply wings on a landing airplane. However, there was blue sky between the objects (i.e. no fuselage) and said objects hovered in the same place, uncharacteristic of a plane. The witnesses are familiar with airborne planes and helicopters due to close proximity to the JNRB airfield, DFW airport, and emergency responder helicopters.
After about 20 seconds, the objects were no longer visible from their hovering location. The witnesses did not see the objects disappear.
Around 10 minutes later, the witnesses observed a military helicopter traveling south, not far from the east side of I-35 W. The helicopter appeared to be a Black Hawk with armament.