Final answer:
En route weather information sources include SIGMET and AIRMET for providing information about significant weather hazards along flight routes.
Step-by-step explanation:
The correct answer is D) SIGMET and AIRMET. En route weather information sources provide pilots with important information about weather conditions along their flight route. METAR (Meteorological Aerodrome Report) provides information about weather conditions at a specific airport, while TAF (Terminal Aerodrome Forecast) provides a forecast for a specific airport. NOTAM (Notice to Airmen) provides information about hazards or changes at a specific airport, and PIREP (Pilot Report) is a report provided by pilots about current weather conditions during flight. ATIS (Automatic Terminal Information Service) provides updated weather information specific to an airport, while AWOS (Automated Weather Observing System) is similar to ATIS but provides information remotely.
SIGMET (Significant Meteorological Information) provides information about significant weather hazards such as severe turbulence, icing, or thunderstorms, while AIRMET (Airmen's Meteorological Information) provides information about weather hazards that may be of interest to all aircraft, such as moderate icing or turbulence. Therefore, the correct en route weather information sources are SIGMET and AIRMET.