Aitken is credited as co-winner of the American Grand Prize race, which was held at the Santa Monica Road Race Course on Nov 18, 1916.
ˈeɪtkən ɪz kɹˈɛdɪɾᵻd æz kˈoʊwˈɪnɚɹ ʌvðɪ ɐmˈɛɹɪkən ɡɹˈænd pɹˈaɪz ɹˈeɪs, wˌɪtʃ wʌz hˈɛld æt ðə sˈæntə mˈɑːnɪkɚ ɹˈoʊd ɹˈeɪs kˈoːɹs ˌɔn nˈɑːv ˈeɪtiːn, nˈaɪntiːnhˈʌndɹɪd sˈɪkstiːn.