3 sentences

1. 我担心的是我的飞行器。

   wǒ dān​xīn de shì wǒ de fēi​xíng​qì.

   It's my flying machine I'm worried about.

   Source: OpenSubtitles

2. 无人机是一种常见的飞行器。

   wú rén jī shì yī zhǒng cháng​jiàn de fēi​xíng​qì.

   Drones are a common type of aircraft.

   Source: Dong Chinese Dictionary

3. 工程师们正在对这种新飞行器的原型进行地面测试。

   gōng​chéng​shī men zhèng​zài duì zhè zhǒng xīn fēi​xíng​qì de yuán​xíng jìn​xíng dì​miàn cè​shì.

   Engineers are conducting ground tests on the prototype of this new aircraft.

   Source: Dong Chinese Dictionary