代だい替たい機き

noun

substitute device; replacement unit

Used for a device (e.g., phone, tablet, laptop) provided as a temporary replacement when the original is being repaired or is unavailable.

• 修しゅう理り中ちゅうは代だい替たい機きを貸かしてもらえますか？

  Can I borrow a replacement device while mine is being repaired?

noun

replacement aircraft; substitute plane

Specifically refers to an aircraft substituted for the originally scheduled one, often due to maintenance or operational reasons.

• 機き材ざい繰ぐりの都つ合ごうで、本ほん便びんは代だい替たい機きでの運うん航こうとなります。

  Due to aircraft scheduling, this flight will be operated with a substitute aircraft.