Aeronautical Message Handling System (AMHS) or Air Traffic Services Message Handling System (ATSMHS) is a standard for aeronautical ground-ground communications (e.g. for the transmission of NOTAM, flight plans or meteorological data) based on X.400 profiles.
The Basic ATSMHS performs an operational role similar to the Aeronautical Fixed Telecommunication Network with a few enhancements.
Similar solutions are offered by Indra Avitech GmbH (Germany), Intelcan (Canada), TELEFONICA (Spain), IDS AirNav (Italy, Canada), Copperchase Ltd (UK), Radiocom (USA) working together with Skysoft Servicios S.A. (Argentina) and FREQUENTIS (Austria).
The first operational AMHS connection in the Middle East was established in 2009 between the United Arab Emirates (Abu Dhabi) and Oman.
The up-to-date worldwide implementation status of AMHS is recorded in the ICAO COM Charts which are available from the AMC (ATS Messaging Management Centre) operated by EUROCONTROL.