boarding card的复数形式怎么写？

Holding the transit boarding card passenger, please get on first.持过站牌的旅客请先登机.I see by your boarding card that we're on the same flight.我看你的登机牌和我一样,我们是同一架班机的.May I see your passport and boarding card, please ?可以看你的护照...

boarding card的音标：...

n.乘车证，乘客证...