Business: Industry Analysis

Most federal agencies collect statistics related to their subjects. For example, airline statistics are available from Bureau of Transportation Statistics, airline and airports statistics.

USA.gov has a searchable list of federal agencies to help you look for ones that may be helpful to you. ​

Economic Census 
The Economic Census is conducted every five years in years ending in “2” and “7”. 

TIGER Web
A valuable resource for people working in fields like urban planning, cartography, and data analysis, as well as for anyone interested in learning more about the geography and topology of the United States.
An introductory manual is at this link. You can also watch an introductory video on YouTube.

Industry Economic Accounts from the Bureau of Economic Analysis. The industry economic accounts, presented both in an input-output framework and as annual output by each industry, provide a detailed view of the interrelationships between U.S. producers and users and the contribution to production across industries.

Bureau of Labor Statistics – U.S. Department of Labor

Industries by Supersector and NAICS Code An Index to the Industry Resources from Bureau of Labor Statistics. The list of industries is arranged in North American Industry Classification System (NAICS) code order. It covers a number of topics including workforce Statistics, Earnings and Hours, Fatalities, Injuries, and Illnesses, Prices, Workplace Trends, etc.

The National Bureau of Economic Research (NBER) - leading nonprofit economic research organization.

Economic Indicators and Releases It provides links to the major economic indicator sources; updated on daily basis

Economic Research Service - US Department of Agriculture

Provides research about the economics of agriculture.

Don't forget state agencies! Here are some agencies with business related information.

Center for Workforce Research and Information

Labor Statistics from the Maine Department of Labor

Maine Department of Economic & Community Development

Maine International Trade Center

Office of Professional and Occupational Regulation

Keep in mind that all other United States states and territories have websites as well, about their businesses and economies.  These could also have useful information for research.