Alliance for Telecommunications Indust… 
Automatic Terminal Information Service 
Advanced Traveler Information Systems 
Automated Terminal Information Service 
Atherton Tools Interface Specification 
Advanced Traveler Information System 
Automated Terminal Information System 
Automatic Terminal Information System 
Air Traffic Information System 
Automatic Transmitter Identification S… 
Advanced Technical Information Support 
Alliance of Telecommunications Industr… 
Army Training Information System 
A Tool Interface Standard 
advanced technical information system 
Advanced Telemetry Instrumentation Sys… 
ADVANCED TISSUE SCIENCES, INC. 
ADVANCED TRAVELLER INFORMATION SYSTEM 
Aerodrome Terminal Information Service… 
AIDS Treatment Information Service 
Air Terminal Information System 
Air Traffic Information Service 
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Airport Terminal Information Service 
Airport Terminal Information System 
airport traffic information system 
AIT Tourist Information System 
Alliance for Telecommunications Indust… 
Alliance of Telecommunication Industry… 
Alliance Telecommunications Industry S…