Aero Express in the only US Authorized Distributor for Tel-Instruments. We buy, sell, trade, and rent TIC commercial products with capabilities for TCAS, Mode A, C, S Transponder, DO260B, DME, VOR, ILS, NAV, COMM, ADS-B, and TIS-B. Tel-Instrument Electronics Corp. (TIC) is a recognized world leader in the design and manufacture of avionics test equipment. Tel-Instruments has a 60-year tradition of leadership and innovation and the company continues to expand its product line and services to meet emerging customer needs. They specialize in manufacturing multi-function boxes to improve efficiency, allow for better ease of use, and reduce cost of operation.