Qǐng chūshì nín de dēngjīpái hé hùzhào.
Please show your boarding pass and passport.
Wǒ bǎ dēngjīpái wàng zài jiǔdiàn le.
I left my boarding pass at the hotel.
Xiànzài hěn duō hángkōng gōngsī tígōng diànzǐ dēngjīpái.
Many airlines now offer electronic boarding passes.