There are 3 books in the Airborn series. The newest book is Starclimber which came out in 2009.

1
Airborn

Book cover of Airborn
Matt Cruse is cabin boy aboard the Aurora, an airship which truly is lighter than air. Since the discovery of hydrium, a gas that renders even the heaviest vehicle as light as a feather, airships travel all over the world in the same way as planes do today. Matt himself…
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2
Skybreaker

Book cover of Skybreaker

Former cabin boy Matt Cruse, now a student at the prestigious Airship Academy, is first to identify the Hyperion, the private airship of a reclusive and fabulously wealthy inventor that disappeared forty years ago with its owner. Armed with the Hyperion's coordinates, which only he possesses, Matt, heiress Kate de…

3
Starclimber

Book cover of Starclimber

"Mr. Cruse, how high would you like to fly?"

A smile soared across my face.

"As high as I possibly can."

Pilot-in-training Matt Cruse and Kate de Vries, expert on high-altitude life-forms, are invited aboard the Starclimber, a vessel that literally climbs its way into the cosmos. Before they even…