From the back cover:
"Add the exciting dimension of aerospace combat to your BattleTech games with AeroTech 2 . A companion to the BattleTech Master Rules, Revised , this book contains all the rules and background material you need to add aerospace fighters, WarShips and other spacecraft to your BattleTech and BattleTech RPG games. These rules also support stand-alone air- or space-combat scenarios.
This Revised Edition of the rulebook has been extensively expanded and incorporates more than four years of player feedback to create the most comprehensive set of aerospace rules yet published for the BattleTech universe."