What happens? Does the DC increase by 2 (e.g. circumstance bonus)? Or do they interrupt each other?
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The air elementals are affected by each other's whirlwinds and larger elementals can trap smaller elementals. Generally I think they would find this uncomfortable.
If two air elementals choose to do this, any other creature in the space where they overlap is subject to both whirlwinds and must make Reflex saves against both of them. If one elemental moves, it can either eject creatures that it carries as a free action, leaving them trapped by the other, or presumably make some opposed check (I'd say Strength) to see which elemental keeps hold of the trapped creature.