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Mark Clark → President


Mark at the age of 14, bought a life changing 35 minute ride in a Mustang- an event that set his life's ambitions in motion. He earned his private pilot's license while still in High School and at the age of 18 he began flying T-6s and managed to sell his first of many warbirds.

Mark has been an aircraft broker for over 35 years and has sold in excess of 2,500 aircraft to date with Courtesy Aircraft Sales. And today, he has logged over 6,500 hours including more than 1,500 hours in high performance ex-military aircraft. In addition to his flying, he also holds an Airframe and Powerplant Certificate.

Having such a well rounded, as well as in-depth and hands-on knowledge of historic aircraft, it has made Mark Clark the "Go-To" person in this specialized aviation field.





Kathi Spencer → Office Manager


Kathi joined Courtesy Aircraft Sales in 1997 and manages all accounting functions including accounts payable, accounts receivable, inventory, payroll, job costing and financial statements in addition to all Human Resource needs. She also maintains brokerage and purchase contracts, coordination of all closing paper work and any FAA related issues.

Kathi's background is primarily in the accounting field but has also included sales and marketing support. She has worked in Life Insurance, high-end Commercial Construction, Industrial Construction, and Fine Dining Restaurant industries. She has built her career and experience mainly from working for small, local, family owned businesses.

Kathi was born and raised in a rural setting in neighboring Belvidere, IL. She currently lives in Rockford, has two grown daughters and two granddaughters. Her hope is to, one day, take a Mediterranean cruise. But, for now, Kathi is still fascinated by the warbird industry.

"This is the greatest place to be -- doing what I love in an environment everyday that most people can only dream about. To be able to see, hear, touch and even ride in these chariots of the sky is a humbling reminder of the history of an era gone by."





Darcy Kaapke → Marketing Director & Aircraft Sales


Darcy joined Courtesy Aircraft Sales in July 2009 to provide sales, marketing, and customer service support. Her aircraft sales range from general aviation aircraft to warbirds. In addition to aircraft sales, she is responsible for aircraft background research, maintaining photographs, writing and updating specifications on all aircraft Courtesy Aircraft has for sale. Her other duties include the design of sales and marketing material, as well as the company website and its maintenance. Darcy also coordinates public relations, newsletters, press releases, direct mail campaigns, and company sponsored events.

Darcy was first introduced to historic aircraft by her Grandfather, an accomplished Bristol Beaufighter pilot who served in World War II. He and her uncle, also a professional pilot, have inspired her to pursue a lifelong dream in the aviation field. Darcy started working in the aviation industry at the age of 16. The choice further strengthened her love of aviation which led to earning a private pilot´s license before graduating high school and later an instrument rating. The path continued to Lewis University where she earned a Bachelor´s degree in Aviation Administration in 2008.

Her background includes, most recently, extensive marketing research and sales. Darcy has numerous years of General Aviation Airport Operations, including airport line service, ground service, administrative support and customer service.




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