Tel-Instrument serves the world’s aviation industry with a diverse range of customers and locations. The following list shows a few of the well known and respected companies and service branches that use our products.
| Leading Airlines and Air Transport |
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| American Airlines | Air |
| Continental Airlines | British Airways |
| Delta Airlines | Air Lingus |
| Federal Express | DHL |
| Jet Blue Airways | Emirates |
| Northwest Airlines | |
| Southwest Airlines | Korean Air |
| United Airlines | KLM |
| UPS | Qantas Airways |
| Aerolineas Argentinas | Singapore Airlines |
| Leading Aviation OEMs | |
| Airbus | Gulfstream |
| BAE | Lockheed Martin |
| Bell Helicopter | McDonnell Douglas |
| Boeing | Northrop Grumman |
| Bombardier Aerospace | Raytheon |
| Cessna | Rockwell Collins |
| Embraer | Sikorsky Aircraft |
| Military and Defense |
|
| U.S. Air Force | U.S. Air National Guard |
| U.S. Army | Finnish Air Force |
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Royal Australian Air Force |
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Royal Air Force |
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