Air combat simulators (880521) are specifically designed to replicate combat flight scenarios, while 880529 covers all other ground flying trainers — including procedural trainers and flight-procedure devices — that do not qualify as air combat simulators. The distinction matters for duty rate and export-control classification.

Many articles under this heading are dual-use or defense-related and may be subject to Export Administration Regulations (EAR) or International Traffic in Arms Regulations (ITAR) controls, depending on their specifications and end-user. Importers and exporters should verify licensing requirements with the relevant agency before shipment.