He opened three airports and trained hundreds of pilots, including C. Alfred Anderson, who became the lead trainer of the Tuskegee Airmen.
Early in his career, Buehl worked at BMW as an aviation mechanic.
He left employment at BMW in 1920, when he immigrated to the United States.
While there, Buehl was a mechanic responsible for preparing Franz Zeno Diemer's BMW IV engine for his unofficial world record flight into the stratosphere on June 17, 1919.
During the period he worked for them, in 1926 he obtained his first official pilot’s license.