Moses Lake Boeing Test Facility
Here are some names I was given regarding the Boeing testing at Moses Lake - Rodger Seaman directed the Flight Test Lab, Bob Harris was an engineer in charge of the test lab. Not sure on timelines and era.
Originally, the runway and aviation facilities were built by the military, who named it Larsen AFB. Boeing bought it in 1968. The "North Training Area" was used for military ops. Currently, there is no commercial air traffic, which ended in 2010. There are approximately 150 flights a day at the facility. Half are estimated to be military. The remainder are general aviation.
The Cooper sleuth is named "Sunnie Bell," and she contacted me in 2015. She names an air traffic controller from Larsen AFB, Ed Kingrey, as DBC. Kingrey was an ATC in Portland in 1971, apparently. He was also an ATC in Saudi Arabia, 1982-1985.
I was only able to get general information on Kingrey. He was a county sheriff's deputy in the second half of his life. Nothing jumped out at me that said, SKYJACKER. But Sunnie says she knows the guy and is a True Believer.