I know a bit about Structural Monitoring and the problems of breaking in to the aerospace market.

They have exactly the same issues I had at QHL. Huge barrier to entry, been at it for best part of 20 years, burns cash type business. Getting certified is a mega challenge, especially when your product is looking for defects, not something an aero company wants anyone to know about. Boeing has been spanked heavily by the FAA due to the 737Max, do you think they want anyone poking into their parts to report they were incorrectly made or they fail sooner than originally expected.