Great question. There are actually very few customers for this app. I have worked in this industry (as a broker, for an airframe mfg and now a guidance avionics

Great question. There are actually very few customers for this app. I have worked in this industry (as a broker, for an airframe mfg and now a guidance avionics mfg) for a few years and know many personally. Enough to build it 'virally'. So short answer: email and assisting the converts to invite others. Of course, the standard tools apply as well, but it's a very small niche for sure. The pot of gold at the end of the rainbow is the market data that will be crowd-sourced, not the size of our user base.