ðɪs ɪmplˈaɪz ɐ hˈaɪ dʒˈɛt vəlˈɑːsᵻɾi nˌɑːt ˈoʊnli æt sˈuːpɚsˈɑːnɪk kɹˈuːz, bˌʌt æt tˈeɪkˈɔf, wˌɪtʃ mˌeɪks ðɪ ˈɛɹkɹæft nˈɔɪzi.
This implies a high jet velocity not only at supersonic cruise, but at take-off, which makes the aircraft noisy.