The noun 客 (kè) means "guest," "visitor," or "passenger." It frequently appears as a component in compound words such as 客机 (passenger plane) or 旅客 (traveler). For example, 这架客机 means "this passenger aircraft."
今天家里来了几位客,我得早点回去。
Jīntiān jiā lǐ lái le jǐ wèi kè, wǒ děi zǎo diǎn huíqù.
A few guests came to our home today; I need to get back early.
这趟航班上的旅客大约有两百人。
Zhè tàng hángbān shàng de lǚkè dàyuē yǒu liǎngbǎi rén.
There are approximately two hundred passengers on this flight.
请问您是住店的客吗?
Qǐngwèn nín shì zhùdiàn de kè ma?
Excuse me, are you a hotel guest?