Has that directive been transmitted to the aircraft?
( ( ( Has ( that directive ) ) ( been ( transmitted ( to ( the aircraft ) ) ) ) ) ? )
(ROOT (SQ (VBZ Has) (NP (DT that) (NN directive)) (VP (VBN been) (VP (VBN transmitted) (PP (TO to) (NP (DT the) (NN aircraft))))) (. ?)))
Has radio silence been maintained?
( ( ( Has ( radio silence ) ) ( been maintained ) ) ? )
(ROOT (SQ (VBZ Has) (NP (NN radio) (NN silence)) (VP (VBN been) (VP (VBN maintained))) (. ?)))