Teyon is one of the most prolific publishers and developers on the 3DS eShop, and is returning to the store next week in North America with a title from Japan - it's publishing Iron Combat: War in the Air by Amzy, which arrives in North America on 19th March for $6.99. We've reached out to Teyon regarding a European release and will provide an update once we receive a response.
As the name suggests this is focused on air battles, seemingly transitioning from dog-fights to more focused boss encounters - it looks like a mix of Ace Combat and Liberation Maiden to us. If destroying hundreds of enemies in a mech isn't enough for you, completing missions in the story mode or Free Play will also accumulate currency for upgrades, so it certainly sounds promising.
You can see a trailer for this below, so let us know what you think.