Wade and Dave Eyerly, the founders of Surf Air–an all-you-can-fly Part 135 membership service that operates Pilatus PC-12s on West Coast routes–left the company earlier this month. The brothers started Surf Air in 2011 and launched flight operations in June last year. Last month the company hired former Frontier Airlines chief Jeff Potter as the new CEO.

“They contacted me,” Potter told AIN. “I wasn’t particularly looking and was keeping myself busy in other areas when the board reached out.” He was attracted to Surf Air’s membership model, he said, “and having that as an umbrella over the aviation component. For me it’s the perfect place to find myself.”

While he wouldn’t comment about what prompted the Eyerly brothers to leave the firm they founded (Wade remains an owner), Potter explained that their departure was just part of a company’s “natural progression and evolution.”

The Surf Air business model remains the same: a monthly fee–starting at $1,599–allows members to fly as much as they want on Surf Air’s scheduled flights between the San Francisco Bay Area (San Carlos Airport), Santa Barbara, Burbank and Hawthorne. There are no cancellation fees, and members can book a flight at short notice, as few as 15 minutes before scheduled departure.

Surf Air currently has 434 members, three PC-12s and 65 employees.