Aerospace

AeroVironment(K-12, College, Adult/Professional) (Flying Wing, Skytower Telecommunications, Unmanned Aerial Vehicles, Distributed Energy, Electric & Hybrid Vehicle Systems, Industrial Posicharge, Energy Systems Development, Power Processing)
Astronomical Application U.S. Navy Observatory.Includes Sunrise, Sunset, Moonrise, Moonset, and Twilight; Moon Illumination; Eclipses; Positions of the Sun and Moon; Data for Major Solar System Bodies and Bright Stars; Dates; and other information.
Astronomical Images - Anglo-Australian Observatory (K-12, College, Adult/Professional)
Basics of Space Flight (Caltech's Jet Propulsion Laboratory (JPL)
Biozone BioLinks (Animal Behaviour, Animal Biology, Biodiversity, Biotechnology, Cell Biology, Conservation, Ecology, Evolution, Genetics, Health & Disease, Human Evolution, Human Impact, Microbiology, Plant Biology, Resource Management, Space Biology)
California Academy of Science (EARTH, OCEAN, SPACE) (Research & Collections - Anthropology, Botany, Entomology, Expeditions, Herpetology, Ichthyology, Invertebrate Zoology & Geology, Ornithology & Mammalogy) (Education) (K-12, College, Adult/Professional)
Center For Educational Resources (CERES) Project (From Montana State Univ)
CourseContent
Eric's Treasure Trove of Astronomy and Planetary Science
Extreme Science
Galaxy Page
Genesis Search for Origins - NASA
Global Climate Change (Middle, H.S., College) (Atmosphere, Hydrosphere, Cryosphere, Biosphere, Global Effects) (Good for Physics, Chemistry, Biology, Geology, Meteorology, Oceanography, Sociology)  (National Science Foundation)
History of Aerospace Engineering
How Stuff Works (Engines, Electronics, Gyroscopes, GPS, Hurricanes, etc.)
Inquirer's Guide to the Universe
Interplanetary Superhighway Makes Space Travel Simpler
Jet Propulsion Laboratory, California Institute of Technology, & NASA
Knowledge Network Explorer (SBC)
Meteorology & Weather
NASA
NASA Planetary Photojournal
NASA Spaceflight
National Science Foundation: Geosciences
Nine Planets
Periodic Table (Lenntech) (5 Languages) (K-12, College, Adult/Professional) (From Lenntech) 
(Click on Symbol for Chemical Properties, History, Health Effects, Environmental Effects)
Space.Com
SpaceWander(K-12, College, Adult/Professional)
Space Weather (K-12, College, Adult/Professional)
View of the Solar System
Virtual Reality Moon Phase Pictures
Weather & Meteorology
Windows to the Universe

Airlines

Airline Toll-Free Numbers
Airlines U.S. & International Info
Flight Aware (Airlines + Any Flight)
Flight View(Real-Time Flight Tracking)  (Look for Find-a-Flight)
Frontier Airlines (Good for many Airlines - then click "Access Real Flight Time Status" 
Travel(Within NETN)
U.S. Department of Transportation (Flight Delays, Mishandled Baggage, Oversales, & Consumer Complaints)

Airports

Denver International Airport (DIA)
Quick AID Airport Directory from Yahoo
U.S. Department of Transportation (Flight Delays, Mishandled Baggage, Oversales, & Consumer Complaints)

Air Museums

Canadian Warplane Heritage Museum
National Air & Space Museum (Smithsonian)
San Diego Aerospace Museum
US Air Force Museum

Astronomy

Astronomical Application U.S. Navy Observatory.Includes Sunrise, Sunset, Moonrise, Moonset, and Twilight; Moon Illumination; Eclipses; Positions of the Sun and Moon; Data for Major Solar System Bodies and Bright Stars; Dates; and other information.
Astronomical Images - Anglo-Australian Observatory (K-12, College, Adult/Professional)
Calendar Zone(1)
Calendar Zone (2)
California Academy of Science (EARTH, OCEAN, SPACE) (Research & Collections - Anthropology, Botany, Entomology, Expeditions, Herpetology, Ichthyology, Invertebrate Zoology & Geology, Ornithology & Mammalogy) (Education) (K-12, College, Adult/Professional)
Center For Educational Resources (CERES) Project (From Montana State Univ)
Constellations and Their Stars
Eric's Treasure Trove of Astronomy and Planetary Science
Galaxy Page
Heavens Above
Inquirer's Guide to the Universe
Knowledge Network Explorer (SBC)
*Martindale's * The Reference Desk* (Most Any Subject - Lots of Information Here)
(Many in Science & Math; Astronomy; also includes Engineering)
NASA
NASA Planetary Photojournal
Periodic Table (Lenntech) (5 Languages) (K-12, College, Adult/Professional) (From Lenntech) 
(Click on Symbol for Chemical Properties, History, Health Effects, Environmental Effects)
Space.Com
StarChild
The Nine Planets
View of the Solar System
Windows to the Universe
Your Sky (K-12, College, Adult/Professional) (North America and Europe) (Shows the entire sky as viewed from a given location at a specified time and date.  A stereographic projection is used, as is the convention for printed star maps) (You can also make your own)

Civil & Govt Aviation

Air Force & Department of Defense
Air Traffic Control System Command Center (Delay Information)
AOPA (Aircraft Owners' & Pilot Assoc.)
Civil Air Patrol
FAA
Federal Resources for Educational Excellence
Airlines U.S. & International Info
Flight Aware (Airlines + Any Flight)
Flight View(Real-Time Flight Tracking)  (Look for Find-a-Flight)
FEMA (Storms & Hurricanes During Season & Warnings)
History Net (Then Search for Aviation)
How Stuff Works (Engines, Electronics, GPS, Technology)
Landings (Aviation Info)
Meteorology & Weather
NASA
Return to Midway
Weather & Meteorology

Special

Albatross Project, The

1.  Calculate Distance Between Any Two Points (Also Latitude & Longitude)
     2.  Calculators
     3.  Calculations, Mathematics Resources
     4.  World Travel Tools - Weights & Measure

Earthquake Hazards Program (U.S. Geological Survey, USGS) (K-12, College, Adult/Prof)
Earthquake Information (U.S. Geological Survey, USGS) (K-12, College, Adult/Professional)

Field Trips - The Virtual Field Trips Site (Field Trips involving Deserts, Deserts K-8, 
Fierce Creatures, Hurricanes, Natural Wonders of the World, Oceans, Salt Marshes, Sharks, Tornadoes, Volcanoes) (The "Virtual Blackboard includes Resources in Flight, Photography, 
U.S. Presidency, World Culture, Creative Writing, Dinosaurs, & Insects)  (Many more trips planned for the future)

Paper Airplanes
Physics 2000 Project
Public Education & Business
Travel Favorites
U.S. Department of Transportation (Flight Delays, Mishandled Baggage, Oversales, & Consumer Complaints) (Also Includes Other Types of Transportation Within Site)
U.S. Geological Survey