Weather

• Current weather, forecasts, pilot reports, AIRMETs, SIGMETs and the thunderstorm forecast: Aviation Weather Center (public domain)
• US weather alerts and forecaster notes: National Weather Service; severe storm outlook: NOAA Storm Prediction Center
• US radar and storm tops: NEXRAD via the Iowa Environmental Mesonet; radar elsewhere: RainViewer (personal use, with credit)
• Satellite clouds: NASA GIBS (NOAA GOES, JMA Himawari) and EUMETSAT (Meteosat); dust and smoke: NASA GIBS (OMPS on NOAA-20)
• Winds aloft, freezing level, terrain height and air quality model: Open-Meteo (CC BY 4.0; air quality contains Copernicus Atmosphere Monitoring Service information); measured PM2.5: OpenAQ and the station's provider

Hazards

• US delays: FAA NAS Status; flight restrictions: FAA TFRs
• Tropical cyclones: National Hurricane Center (Atlantic, East and Central Pacific) and GDACS (UN / European Commission) elsewhere
• Earthquakes: USGS; US volcano alerts: USGS Volcano Hazards Program
• Fires: NASA FIRMS (last 24 hours); space weather and aurora: NOAA Space Weather Prediction Center

Airspace and charts

• US airspace: FAA open data; charts: FAA Aeronautical Information Services
• Airspace elsewhere: openAIP (CC BY-NC 4.0)

Airports, routes and traffic

• Airports, runways, frequencies and navaids: OurAirports (public domain); magnetic variation: World Magnetic Model
• US routes, airlines and traffic: U.S. DOT Bureau of Transportation Statistics (on-time data and T-100); routes between two foreign airports: OpenFlights (ODbL, 2017)
• History and photos: Wikipedia (CC BY-SA), matched through Wikidata (CC0)

Map and terrain

• Maps: Stadia Maps, OpenMapTiles, OpenStreetMap contributors, Stamen Design
• Satellite base map: EOxCloudless 2025 by EOX IT Services GmbH, contains modified Copernicus Sentinel data 2025 (CC BY-NC-SA 4.0)
• Terrain shading: AWS Open Data terrain tiles (Mapzen, from SRTM, ETOPO1, USGS and others)