Online References:

Airman's Information Manual (AIM pdf)

Federal Air Regulations (FAR's)

N Number Lookup

AC-U-KWIK Global Airport and FBO Information (includes Control Tower Phone Numbers)

FREE Pilot's License Study Materials:

FAA Pilot's Handbook of Aeronautical Knowledge

Airman's Information Manual

PART 91—GENERAL OPERATING AND FLIGHT RULES

PART 61—CERTIFICATION: PILOTS, FLIGHT INSTRUCTORS, AND GROUND INSTRUCTORS

FAA Aviation Handbooks & Manuals

PAID Pilot's License Study Materials:

PAID Pilot's License Study Materials

Flight Planning:

Flight Service 1800wxbrief.com

FltPlan.com

Graphical TFR's from FAA

FAA NEW Notams Site

SkyVector Charts

AirNav

Minnesota Airports Online

AOPA - Airport Information

My E6B

METAR Historical Data

FlightAware / Flight Tracking

Flightradar24 / Flight Tracking

ADS-B Ground Station Locations

VFRMAP - Digital Aeronautical Charts

Weather:

Flight Service 1800wxbrief.com

Aviationweather.gov/gfa

Windy.com

FltPlan.com

ADDS - Aviation Digital Data Service

AvnWX Weather

National Weather Service

Weather Underground

Weather.com

MnWAS Direct Link for Registered Users

AOPA Weather (AOPA Members)

Flight Safety:

FAAST - FAA Safety Team

FAA Safety Briefing

AOPA  Air Safety Foundation

NTSB Aviation Accident Reports

Military/Hazardous Operations:

FAA Special Use Airspace - Military Active Status

Avian Hazard Advisory System

Defense Internet NOTAM Service

Service Bulletins:

Rotax Owner

Van's Aircraft Service Bulletins

Buy-Sell:

Barnstormers

Trade-A-Plane

Aircraft Spruce

Wicks Aircraft Supply

Lockwood Aviation Supply

Leading Edge Airfoils

Wentworth Aircraft, Inc.

Wag-Aero

Sporty's Pilot Shop

Organizations:

EAA - Experimental Aircraft Association

EAA Newsletters - Special  Interests

AOPA - Aircraft Owners and Pilots Association

TIGHAR - The Earhart Project and more

SCSU Aero Club

News / General Info:

Minnesota Department of Aeronautics & Aviation

MIDWEST FLYER MAGAZINE

Avweb - Aviation News Resource

Click Here for the Virtual Aircraft Museum

Click Here for the The History of Flight