Escapee by Edward Hoornaert

Catt Sayer, an abused peasant and a fugitive from justice on her home planet, makes a meager living flying a decrepit airship that delivers supplies to scattered military bases on an isolated, inhospitable mining moon. When enemies invade the moon and destroy the bases, Catt rescues the lone survivor—Captain Hank Dukelsky, an upper-class army captain. Now Hank wants her to risk her life on an impossible quest to attack the enemy headquarters…and Catt is falling in love with both the man and his magnificently quixotic ambition.