The concept demonstrated here is to enter and manage my aircraft for sale and the contacts associated with it (from a broker's perspective)
With that said - you need to put in some example inventory to show both buyers and sellers what they would really see with a fully populated listing.
Show how after entering all the features of a jet - comparable FEATURE listings come in and tell the poster the pricess for that inventory (you could monetize this feature)
Need to make it easier to select MFR such as engine maker... i.e. select an angine after selecting known manufacturer.
Also - your engine would be FAR more powerful if you preload model configs from various manufacturers. So, i can ladder through a product list based on selecting a particular manufacturer.
The key to success here is in doing all the leg work to get the data from all the suppliers.
Link this info to maintenance records, charge fees for scans to this..
Call it AIRFAX - carfax for airplanes.
Or if you prefer, call it Flightr.com --- a domain you can acquire from me if interested...