The confidence and efficiency of a three-engine configuration.

A Trijet offers many benefits.

Most importantly, it can be more efficient than twin-engine designs and require less runway for takeoff, since required runway length is determined by the power available after the failure of one engine.

In a trijet, the failure of one engine still leaves two-thirds power available, so engines require less excess power reserve and can be more efficiently sized and optimized in terms of power output. Moreover, with two-thirds power available, the wing and empennage surfaces can also be optimized for this configuration and made somewhat smaller, reducing drag.

Lastly, a three-engine configuration, with less thrust emanating from each engine (versus a twinjet configuration) can be quieter, helping to meet noise regulations.

While the original Aerion supersonic business jet was designed to be powered by a variant of the Pratt & Whitney JT8D, the new AS2, being somewhat larger and subject to more stringent noise and emissions criteria, will benefit from a new engine that incorporates more advanced technology.

Today, Aerion is engaged with leading engine manufacturers in a process to define an AS2 engine that would be adapted from a current production engine. Several good options exist; all would entail adapting a modern engine core for a "low-bypass" configuration.