The towers are staffed by contract air traffic controllers at small airports that specialize in general aviation.

在一些小机场，通用航空的合同制空中交通管制员在管制塔工作。

Instead, it caters to a range of  products meant for general aviation.

相反，它迎合了一系列用于通用航空的产品。

The Phoenix-based firm offers  products and services to major planemakers, the business jet market, and even the general aviation  market.

这家位于凤凰城的公司为主要飞机制造商、公务机市场，甚至通用航空市场提供产品和服务。

The overhaul covers all regional air-traffic management bureaus, companies involved in civil aviation transport and general aviation, service providers, airport operators and flight training organizations, among other sectors.

此次安全大检查的范围包括各地区空管局、运输（通用）航空公司、服务保障公司、机场公司、飞行训练机构等。