ATIS (Automatic Terminal Information Service)

Automatic Terminal Information Service (ATIS) is a continuous, recorded broadcast of current aerodrome and meteorological information at busy controlled airports, designed to reduce ATC frequency congestion and ensure that all arriving and departing pilots have access to the same standardized information before their initial contact with the controlling authority. The service is standardized internationally under ICAO Annex 11 (Air Traffic Services), with §4.3 defining the content and update requirements, and in the United States under FAA Order 7110.65 (Air Traffic Control) and the Aeronautical Information Manual (AIM) Chapter 4.

Each ATIS broadcast contains a defined set of information elements in a prescribed sequence: the airport name and ATIS identifier letter, the time of observation, wind direction and speed (in magnetic degrees and knots in the US; true degrees for international ICAO operations), prevailing visibility, significant weather phenomena (using the same abbreviated codes as METAR — TS, RA, FZRA, BR, FG, etc.), sky condition (cloud layers with coverage and height, or ceiling and sky obscuration), temperature and dewpoint in Celsius, altimeter setting (in inches of mercury in the US with A prefix; in hectopascals with Q prefix in ICAO states), active runway(s) for arrivals and departures, approaches in use, and any applicable NOTAMs or special aerodrome conditions such as runway surface contamination, displaced threshold, or ATC equipment outages. The broadcast is typically 45–75 seconds in length and repeats continuously on a dedicated VHF frequency published in the Chart Supplement (US) and on approach plates.

When any significant change occurs in the reported information — a ceiling dropping, visibility changing, a different runway being activated, or a new altimeter setting — a new ATIS broadcast is issued and identified with the next letter in the phonetic alphabet, cycling from Alpha through Zulu and back to Alpha. Pilots are required, by AIM and published procedure, to obtain the current ATIS before entering the Class B, C, or D airspace environment and to report the information identifier on first contact with ATC (e.g., "Approach, N4512G, information Kilo, 20 miles northeast inbound"). If the ATIS identifier the pilot reports does not match the current letter, the controller knows the pilot has outdated information and can relay any changed conditions.

Two ATIS variants exist with different delivery mechanisms. Voice ATIS (the original service) is a looped voice recording broadcast on a dedicated VHF frequency, accessible to any aircraft with a standard communications radio. Digital ATIS (D-ATIS) is a text-based version uplinked to aircraft avionics via ACARS (Aircraft Communications Addressing and Reporting System) or VDL Mode 2 (VHF Digital Link), eliminating the need to tune and listen to the voice broadcast. D-ATIS is used primarily by air carriers and glass-cockpit general aviation aircraft with ACARS capability; the FAA has progressively expanded D-ATIS availability at major airports and en-route facilities. ICAO Doc 9694 provides the data link ATIS (D-ATIS) specifications for international interoperability.

At some smaller controlled airports and certain international aerodromes, a combined VOR/ATIS facility means the ATIS identifier frequency is co-located with a VOR identifier or UNICOM frequency. Pilots operating at uncontrolled airports that do not have ATIS service obtain weather information from Automated Surface Observing System (ASOS) or Automated Weather Observing System (AWOS) broadcasts on published frequencies, which serve a similar function but are not technically ATIS — they lack the runway-in-use and ATC operational information components.

For student pilots, the ATIS call is often the first radio task performed at a new airport — making ATIS comprehension a fundamental early solo skill. Instructors teaching radio procedures spend ground time specifically on ATIS format, the phonetic alphabet identifier cycle, and the procedure for reporting the information letter to ATC. A student who calls "Tower, Student Pilot, N12345, 3 miles south, inbound landing, information Tango" has demonstrated that they received current conditions, know the active runway, and have the altimeter set to the broadcast setting — a significant operational safety check performed in a 10-second radio call.

For flight school dispatchers, the ATIS (or ASOS/AWOS equivalent) is the ground truth for conditions at the departure airport at the time of takeoff, complementing the most recent METAR in the dispatcher's preflight assessment. When a METAR is 45 minutes old and conditions have been deteriorating, the current ATIS may reflect a ceiling and visibility that the hourly METAR has not yet captured — making ATIS the higher-fidelity source for last-minute go/no-go decisions on departure.

Aviatize's smart planning and booking module integrates current weather data — including METAR observations that track alongside ATIS information — into the dispatcher's scheduling dashboard, giving ground staff the same situational awareness as a pilot tuning the ATIS frequency before engine start. By presenting the latest reported ceiling, visibility, and altimeter at the training airport alongside the day's booking list, Aviatize allows dispatchers to proactively identify lessons that will be compromised by conditions visible in the current observation before the student ever calls to confirm departure.

For instrument rating and commercial training programs, Aviatize can record the ATIS information identifier and reported conditions as part of the lesson log entry at departure and arrival, building a structured record of what conditions students encountered at key training milestones — first solo, first solo cross-country, first ILS approach to minimums. This level of detail supports Part 141 course completion documentation, insurance audits, and chief instructor reviews of whether students are receiving the diversity of meteorological conditions required by their training syllabus.