Number + 架 + Noun
架 (jià) is a measure word used for counting airplanes, pianos, and other large mechanical or structural objects. It is placed between a number and the noun it quantifies.
天上飞过两架飞机,声音很大。
Tiān shàng fēi guò liǎng jià fēijī, shēngyīn hěn dà.
Two airplanes flew overhead, making a loud noise.
这个机场每天起降上百架航班。
Zhège jīchǎng měitiān qǐjiàng shàng bǎi jià hángbān.
This airport handles over a hundred flights taking off and landing every day.
他家客厅里摆着一架钢琴。
Tā jiā kètīng lǐ bǎizhe yī jià gāngqín.
There is a piano displayed in his living room.