ɪn dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi hiː wɪθdɹˈuː fɹʌm θˈeɪɚ tə fˈoʊkəs ˌɔn hɪz stˈʌdiz ænd əbtˈeɪnd ðə kəmˈɜːʃəl flˈaɪɪŋ lˈaɪsəns ænd ðə flˈaɪt ɪnstɹˈʌktɚ lˈaɪsəns.
In December 1980 he withdrew from Þeyr to focus on his studies and obtained the commercial flying license and the flight instructor license.