Once you figure out how many bonus levels to apply, the place to apply them is the xExtraLev field on the domain abilities themselves - so in the case of the air domain, you'd want to add it to dAirArc, dAirRes6, dAirRes12, and dAirRes20.
I think it'll work to just add to the xExtraLev field on the domain itself - I think we have things set up such that the domain's powers will calculate their effective level based on the domain. You'll want to apply that bonus level in the pre-levels phase, so that it's already in place before the level calculations start on the individual abilities.
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