tˈuː mˈoːɹ ˈɛɹkɹæft kæn biː ʌnlˈɑːkt; wˈʌn vˈaɪə pˈʊʃbˈʌʔn̩ kˈoʊd, ænd ðɪ ˈʌðɚ baɪ səksˈɛsfəli kəmplˈiːɾɪŋ ˈɔːl ʌvðə mˈɪʃənz ɪnðə ɡˈeɪm ɪŋklˈuːdɪŋ ðə bˈoʊnəs mˈɪʃənz.
Two more aircraft can be unlocked; one via push-button code, and the other by successfully completing all of the missions in the game including the bonus missions.