Building on a legacy of engineering experience and excellence.

Aircraft Performance Group (APG) is a flight operations engineering firm based in Castle Rock, Colorado and founded in 1999. The firm’s primary product and service focus is on takeoff, landing, and weight and balance services for airline and corporate operators.

From 1981 to 1995, APG‘s founders operated Aircraft Performance Unlimited, Inc., an airline-engineering firm that provided a complete, integrated, airline-dispatch system that quickly grew to support over 65 airlines around the world. In 1995, Jeppesen, a Times Mirror Company, acquired Aircraft Performance Unlimited and fully integrated it into their service offerings.

Sensing the need for flight operations engineering expertise and services in the corporate aviation market, our founders then created APG. Bringing airline operations experience and adapting service solutions to the corporate aviation market, APG has grown quickly to become one of the leading service providers in the market. Today, APG apps and services are used by pilots and aircraft operators at dozens of airlines and on more than 5000 corporate aircraft from around the world.

Leadership Team

  • Rogers V. Hemphill, Co-Founder

    Rogers Hemphill began his flying career with the United States Air Force, eventually retiring as a Lt. Colonel. He was an airline pilot for Hughes Airwest and Republic Airlines before retiring as an A320 Captain with Northwest Airlines.

    Hemphill has ATP ratings in the CV580, DC9, MD 80, and A320 aircraft and has been an FAA Designated Check Airman for the DC9, MD 80, and A320. He has extensive experience in both flight planning and aircraft performance engineering, as well as flight crew training and procedures.

    Hemphill has a Bachelor of Science in aerospace engineering from NYU Polytechnic and a master’s degree in systems management from the University of Southern California.

  • Mark Thelen, Co-Founder

    After graduating from the University of Minnesota with a bachelor’s degree in aeronautical engineering, Mark Thelen became a performance engineer for Republic Airlines. He attained an ATP rating in the B727, and has over 4,500 hours flying commercially for Sun Country Airlines and Delta Airlines.

    As a co-founder of Aircraft Performance Unlimited, Inc. (APU), Thelen gained extensive experience in Airplane Flight Manual interpretation and the development of aircraft performance programs.

    With the acquisition of APU by Jeppesen, Thelen served as Director of OpsData.

  • Mike Caflisch, Chief Executive Officer

    With more than 30 years in the aviation industry, Mike Caflisch has had career assignments in numerous disciplines, including aircraft performance engineering, avionics systems engineering and integration, software development, product management, marketing, sales, business development, strategy, and program management.

    Caflisch came to APG from The Boeing Company, where he served as director of Airspace Programs for Boeing Commercial Aviation Services. In this role, he was responsible for programs supporting flight optimization, airspace and navigation procedure design, and air traffic management. Prior to that, he led strategy and business development for Boeing Flight Services.

    Caflisch holds a bachelor’s degree in aerospace engineering and mechanics from the University of Minnesota and an MBA from the University of St. Thomas.

  • Gene Albright, Chief Engineer

    Gene Albright began his career as a design engineer at Raytheon Aircraft Company. After moving to Cessna, he advanced to Performance Engineer. He finished his career at Cessna as Lead Specialist Engineer in charge of the Technology Development Group within the Performance Engineering department.

    During his time at Cessna, Albright directed the development and certification efforts of Cessna’s performance calculation software package, CESNAV. He has a deep understanding of Airplane Flight Manual data development processes and a history of implementing those processes into software solutions. Additionally, Albright has earned a Six Sigma Black Belt certification.

    He holds a Bachelor of Science degree in aerospace engineering and a Master of Business Administration, both from Wichita State University.

  • Jeffrey Anderson, Chief Technology Officer

    Jeffrey Anderson began programming at a young age. In 1989, he was hired as a programmer at Computer Science Corporation and quickly rose to a role supervising other programmers and supporting over 100-System 370 IBM mainframe computers.

    Anderson has experience in mainframe, client/server, cloud, mobile platforms, networking, hardware, Agile development, and numerous programming languages. Through senior-level positions at Western Pacific Airlines, Jeppesen, and Optika, he has made significant IT contributions in multiple industries. He has been at the forefront of application and service development efforts for APG since early in the company’s history.

    Anderson was named APG‘s Chief Technology Officer in 2010.

  • Roger Hemphill, Weight & Balance Design Manager

    Roger Hemphill joined APG in 2005 as an Airport Analyst with an initial focus on building and maintaining an airport database. As APG expanded to offer weight and balance services, he shifted his focus to concentrate on weight and balance engineering. Today, he serves as APG‘s Weight & Balance Design Manager.

    In this capacity, Hemphill is responsible for weight and balance template development and maintenance, along with design and support for new weight and balance functionality.

Corporate Citizenship

APG gives back to the community.

APG is committed to supporting the aviation industry. We regularly provide training seminars with many of our key partners. As a member of the National Business Aviation Association (NBAA), APG looks forward to meeting customers and community members at the various NBAA conferences and affiliate events each year. We also actively support the industry through engagements where we provide our expert opinions and subject matter expertise.

Through our commitment and contributions supporting military and civic organizations, APG gives back to its community. We provide regular support to the Wounded Warrior Project and Civil Air Patrol, and we provide employer support for the National Guard and Reserve. In our local community, we support various organizations such as St. Jude Children’s Research Hospital and Wings of Hope for Pancreatic Cancer Research at the University of Colorado Cancer Center – Anschutz Medical Campus.

APG doesn’t view corporate and community citizenship as a choice but rather as an obligation.