Ross says the company has targeted aircraft families that provide the largest market potential, but adds the company is not planning to focus only on diesel. “Right now our focus is on validating that all our engines will work on the correct fuels,” he says.

While it is still early to tell how the diesel options will take in the long run in the U.S., he says the narrow price differential, availability and performance benefits will make avgas the likely choice in the U.S. for some time.

In other areas, that won’t be the case, he says. Not only is availability a factor, but also cost. In Europe, for instance, the cost of avgas is almost twice that of Jet A fuel, he notes.