Career
Most notably, he was the administrator during an en-masse calling-in sick strike of air traffic controllers during 1969. In the summer of that year, Shaffer himself testified in front of a congressional committee, reporting that air traffic controllers were neither overworked nor underpaid. Shaffer"s testimony, coupled with increased pressure on individual controllers to return to their jobs, Francis Lee Bailey of the Professional Air Traffic Controllers Organization stated "This guy Shaffer has got to go." The Federal Aviation Administration and Shaffer were both later attacked by the PATCO for continuing to operate despite the low number of air traffic controllers.
On December 3, 1970, he testified to Conngress about aviation safety.
Following his retirement from his position in the Federal Aviation Administration, Shaffer was involved in the ongoing debate over both the inclusion of Microwave landing systems in civil aviation during 1978 and to whom the contract for construction of such devices should be awarded, American, British or German companies. Shaffer himself agreed with British assessments that the American manufactured Master of Library Science system was inferior and poorly tested.