This is the 6654th most frequent Chinese word.
机上
"机上" means "onboard" or "on the plane."
In this sentence, '机上' refers to 'onboard' specifically in the context of an airplane, indicating the services available during a flight.
机上提供了免费的Wi-Fi供乘客使用。
Free Wi-Fi is provided onboard for passengers.
Here, '机上' again means 'onboard,' describing the state or condition of arrangements within the airplane.
机上的座位安排已经完成。
The seating arrangement onboard has been completed.
In this context, '机上' signifies 'onboard' concerning the rules or conditions maintained while inside the airplane.