Yeah, the usage in the trailer gives it away.... "sola"=="sora"=="sky"
The japanese are famous for loving romaji in a visual/pictorial way as well and it may be that "sola" just looked nicer than "sora" to them.
People often forget that romaji is just a rough approximation anyway (for that matter, the -kana themselves are sometimes just rough approximations to the sounds being made: the "su" or "shi" pronunciation style in verb endings depending on the regional dialect for example).
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