There are 2 books in the Signal Airship series. The newest book is By Fire Above which came out in 2018.

1
The Guns Above

Book cover of The Guns Above
They say it's not the fall that kills you.

For Josette Dupre, the Corps first female airship captain, it might just be a bullet in the back.

On top of patrolling the front lines, she must also contend with a crew who doubts her expertise, a new airship that is…
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2
By Fire Above

Book cover of By Fire Above
'All's fair in love and war,' according to airship captain Josette Dupre, until her hometown becomes occupied by the enemy and her mother a prisoner of war. Then it becomes, 'Nothing's fair except bombing those Vins to high hell.'

Before she can rescue her town, however, Josette must maneuver her…