飞机值机是乘客登机前必须完成的一项手续，而值机时间对于乘客来说也是非常重要的。下面是一篇关于飞机值机时间介绍的英语文章。

Airline Check-in Time

Airline check-in is an important procedure that must be completed by passengers before boarding. The check-in time is also crucial for passengers to ensure they board their flight on time.

The check-in time for domestic flights is usually 2 hours before departure, and for international flights, it is usually 3 hours before departure. However, it is always best to check with your airline in advance to confirm the check-in time for your specific flight.

Passengers can check-in at the airport counters or online through the airline's website or mobile app. Online check-in usually opens 24 hours before departure and closes 1 hour before departure for domestic flights and 2 hours before departure for international flights.

Passengers who have checked in online can proceed directly to the security checkpoint upon arrival at the airport. Those who need to check-in at the airport counters should arrive early to avoid long queues and ensure they have enough time to complete the check-in process.

It is important to note that airlines have strict check-in deadlines, and passengers who arrive after the check-in deadline may not be allowed to board their flight. Therefore, it is always best to arrive at the airport early and allow plenty of time for the check-in process.