Not that it exactly falls into the purview of the HBA but since we're on the topic of available designs, and there's some assumption that one buying a design would do so to make it some kind of business distraction on their life; I wonder how many certified aircraft designs are out there with someone sitting on all the paperwork but unwilling or unable to do anything with it. With a design for a kit or plans-built, you can just buy it and there's no significant requirements beyond that. I assume if you own the type certificate rights then, there's a lot of extra baggage along with it from legacy? Are there maintenance fees or reporting duties that you must now submit to the various authorities just for owning the paper, or does it only matter if you're setup and actively executing on it? For every homebuilt design out there, and for all the expense it is to certify a modern aircraft, are there not legions of abandoned certificates sitting in some entity's archives that could be reinstated as (theoretically) viable product? I could even see a situation where a certificate holder could agree for a different company to fabricate, build, test, market, insure, etc all under license. It was done in the past. I'm not super up on how that is handled. Say Cessna were to license, say, "Double Summit Aviation Empire" to produce a version of the 150 but with all the latest avionics and everything and give it "hella sick" pantschemes, are those 150s still Cessna's problem? Do they need their own new certificate? Or a sub certificate? Is Cessna writing off on the factory being up to standards and ultimately responsible for what their licensee does with their charter? Or is the FAA bypassing Cessna entirely and doing inspections of the DSAE factory and treating DSAE as the type holder in all practical terms? (For the record I simply made DSAE up on the spot as a reference to twin peaks and not as some sly reference to an actual company. And I havn't even really watched Twin Peaks so...) If it's a really old design, it's not like you'd need a facility any more advanced than what your mid-tier kitplane mfgs are already established with. And so I'm curious why it hasn't been more common other than rights holders wanting nothing more than to never see any more legacy liabilities see the light of day, or that there just is less than no market for such a proposition. But if you thought there was a market, if you went to, say, whoever owns the paperwork for the Spartan Executive and say "I'll buy the rights and titles and lands and castles for X dubloons" then it seems like it shouldn't be some huge problem for the person sitting on that currently; and it might be free money for them. A helluvalot of work for whoever takes over all those titles (and hopefully they're "huuuuuuuuge tracts of land") but maybe the idea of the rejuvinated classic is tantalizing for some. OF course I think we've seen a few such attempts and none have yielded anything much of note. Probably a lot of money spent on very little. But it's always so darn tempting. And those factory fresh WACOs always make the prospect seem so romantic.