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John Sjaardema

Owner of Excel-Air Services and licensed IA with over 43 years experience in the aircraft maintenance industry.

Derek de Jong

Licensed A&P/IA with over 27 years experience in the aircraft maintenance industry.

Eric Pletting

Retired A&P and Private Pilot. Over 16 years with Excel-Air in aircraft maintenance, now doing website and social media for the gang.

Jack Hamstra

Licensed A&P and Private Pilot with over 23 years in the aircraft maintenance industry. Presently serving with MAF as a missionary technician.

Kim Dase

Office Manager

Extensive background in accounting and office management.


Paul Rupprecht

Licensed Certified Flight Instructor with more than 1500 instruction hours.

Jon Yokovich

Three years in the aircraft business, 20 years experience in mechanical maintenance field. A&P trainee, Inventory and parts man.


Caleb de Jong

6 years experience in aircraft maintenance, A&P trainee, and scheduler.



Company History

John Sjaardema, owner and President of Excel-Air Services, Inc. is married to Cheryl and has three lovely daughters:  Andrea, Kim, and Melanie.  John earned his A&P license in 1972 in Denver, CO, and became an active IA in 1976.  For seven years John and his wife served as missionaries for the Christian Reformed Board of World Missions in Nigeria, as mechanic and pilot.  In 1982, after settling back in the United States, John began a new company called New Kent Aircraft Servicing, in Kentland, IN.  After seven years John moved his business to DeMotte, IN.  During the company’s eleven years in DeMotte, it became incorporated under the name of Excel-Air Services, Inc.  On March 1, 2000, Excel-Air moved to its current location at the Jasper County Airport(KRZL) in Rensselaer, IN. John Sjaardema and the staff of Excel-Air Services have been providing quality aircraft maintenance for nearly 25 years.   Please read the testimonials of our many satisfied customers.

Purpose Statement

Our company name describes our purpose.  In the Bible, in Philippians chapter 4, we read these words:  “Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable - if anything is excellent or praiseworthy - think about such things.”  This, in a nutshell, explains our intent in serving our customers.  Each time we say our company name or see it in print, it is a constant reminder and incentive for us to do just exactly what it says - not just get the job done, but to excel in every aspect of our work.   As Christians, we are serving God and giving Him honor and glory by doing our best in excellence.  This is done out of gratitude to Him for giving us the greatest gift of all, eternal life with Him.  Romans 11:36 says it best.  “For from Him and through Him and to Him are all things.  To Him be the glory forever!  Amen.”

About Our Logo

On our logo you will see the “Fish” design and  the “Cross.”  These are Christian symbols that have an interesting history.  About forty years after Jesus Christ died, was resurrected, and ascended into Heaven, the followers of Christ - then called Christians - were persecuted by the Romans.  It became very dangerous for them to walk about and talk openly about their faith.  As two people would meet on the walking path, one would draw in the sand a half moon shape.  If the other individual was a Christian, he would recognize this and draw the opposite side of the shape - thus forming the shape of a fish.  They then knew that they could talk freely about their faith.  If the other person was not a Christian, he would not understand the shape and would simply ignore it.  Jesus Christ in His earthly ministry called many men to be His followers.  They were to be fishers of men.  From that time on, the symbol of the fish represents the very purpose for which we live:  to draw mankind to Christ - to fish for men.