[2][3] HEICO's Flight Support Group is the largest independent provider of FAA-approved aircraft replacement parts.

[4] It is a provider of aircraft accessories component repair and overhaul services for avionic, electro-mechanical, flight surface, hydraulic and pneumatic applications; commercial aviation and military aviation parts distribution; and a manufacturer of other aircraft parts.

After an acquisition in 1974, HEICO focused on replacement parts for commercial aviation as well as providing maintenance and repair services.

Since the 1990s, a significant part of HEICO's business strategy has been acquiring niche product and service providers in the aviation, defense, space, medical, telecommunications, and electronics industries.

[1] Acquisitions include: Engineering Design Team, Inc. (2005),[5][6] Switchcraft (2011),[7] Quell Corporation (December 2019),[8] BERNIER (July 2019),[9] Research Electronics International, LLC (June 2019), Decavo, LLC (February 2019), Solid Sealing Technology, Inc., Apex Microtechnology, Inc., Specialty Silicone Products, Inc., Optical Display Engineering, Emergency Locator Transmitter Beacon product line of Instrumar Limited, and Sensor Technology Engineering, Inc.