Several U. S. air carriers say services will remain unavailable until conditions improve.

几家美国航空公司表示，在情况改善前暂不提供服务。

People Express, one of the first no-frills, low-fare air carriers, has been in financial trouble lately.

人民航空是最早的廉价经济型航空公司之一，最近陷入了财务困境。

The FAA says US air carriers are now voluntarily avoiding all air space near the Russia-Ukraine border.

联邦航空管理局表示，美国航空公司目前主动避免进入俄乌边境附近的空域。

Trump added that the decision was made with the help of U.S. air carriers, aircraft manufacturer Boeing and Canadian aviation officials.

特朗普还表示，这一决定是在美国航空公司、飞机制造商波音公司以及加拿大航空官员的协助下做出的。

Last year, Alphabet's Wing, a sister company of search engine Google, was the first to get U.S. air carrier approval for a single-pilot drone operation.

去年，Alphabet公司旗下的Wing公司成为首家获得进行单飞行员无人机操作的美国航空承运人认证，Wing公司是搜索引擎谷歌的姊妹公司。