Definition
A data service that delivers non-control aeronautical information to pilots in flight, including weather products, NOTAMs, TFRs, and other advisory information. In the United States, FIS is most commonly delivered free of charge over the ADS-B network as FIS-B, and is also available through commercial satellite-based providers. It is advisory only — it does not provide air traffic control instructions or separation services.
Plain English
A service that sends weather and other flight information to your cockpit display while you are flying. It gives you helpful information to plan and stay safe, but it does not give you instructions from air traffic control.
Context Anchor
Seen on electronic flight displays and multi-function displays when reviewing weather products, product age, and expiration times.
Derivation
‘Flight Information’ comes from the international aviation idea of a Flight Information Region — airspace where advisory information is provided to pilots, separate from active air traffic control. ‘Service’ here means an ongoing data feed, not a single transaction. Knowing this helps explain why FIS is advisory and continuous rather than instructional.
Why Pilots Care
Gives pilots access to timely information needed for safe route and altitude decisions without leaving the cockpit.
Analogy
It is like checking a weather app before driving: the information may be useful, but you still need to notice when it was last updated.
Intuition Check
FIS does not mean the displayed weather is live or automatically safe to use. It means flight information is being provided, and the pilot must check its age and use judgment.
Example Sentence 1
The pilot used FIS weather on the MFD to see a line of thunderstorms ahead and requested a deviation from ATC.
Example Sentence 2
FIS delivered updated weather data that helped the pilot avoid an area of building thunderstorms.