I usually recommend when doing industry research that you start by finding out what classification number the U.S. Government has assigned to that industry. They collect a lot of data about industries and make it available for free to everyone.
Trade or industry associations are a great source for information on an industry. Sometimes they have free information available. Other times it is restricted to members of that organization.
In addition to the name of the industry (ex: hotel OR hospitality OR lodging), other terms that I like to use in searches for industry information include:
In recommended order, here are the databases available to assist you with industry research:
Search for the name of the industry in business articles. Sometimes you will find statistics or research quoted in the articles that would normally only be available to members who pay membership fees to access.