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24 minutes of radio silence?
Be Careful on how to read this press reslease :
Apparently the aircraft was cleared to a specific reserved area to make a demo flight that included some orbits (360s) .once the instructions to enter the area and to perfom the first orbit were issued , it is normal for ATC anf the crew not to call each other .the next calls will be when the aircraft crew request to leave the area to go back to land , or if another aircraft would enter the area . So 24 min without calling each other is normal under the circumstances . This is not a radio comm problem .