Most industries have a professional association that collects data and provides resources for members. Their websites can have a wealth of information that may not be available elsewhere. Some data may be for members only, but it's worth checking. Look for pages such as "resources", "data", "news", or "research".
Associations are especially helpful for smaller industries, when data may be hard to find elsewhere.
While not comprehensive, Wikipedia maintains a list of major associations organized by industry
Structure a search with: industry name + association
Example: Aircraft + association
Associations for Specific Industries
Below are just a few examples of trade associations for major industries