Additional planes can also be unlocked for the multiplayer mode based on progress in the single-player campaign.
ɐdˈɪʃənəl plˈeɪnz kæn ˈɔːlsoʊ biː ʌnlˈɑːkt fɚðə mˌʌltɪplˈeɪɚ mˈoʊd bˈeɪst ˌɔn pɹˈɑːɡɹɛs ɪnðə sˈɪŋɡəlplˈeɪɚ kæmpˈeɪn.