乘机小知识：距离起飞时间还有半小时却不可以办理手续了，为什么呢？

大家又没有这样的疑惑？为什么明明还有半个多小时，却不可以办理值机手续了？即使我们已经乘机，但是在起飞前工作人员还有工作要做。例如： 

保障飞行安全 

飞机的载重平衡对飞行安全至关重要，起飞前需要精确计算乘客人数、行李重量和燃油载荷等，以确定飞机的重心是否在安全范围内。如果在起飞前半小时还办理手续，新增的乘客及行李可能导致平衡计算失误，增加飞行风险。 

确保工作效率 

起飞前半小时，地勤人员需按载重平衡图将行李装到货仓，若此时有新乘客登机，其行李可能需要重新安排装运位置，耗费额外时间和人力。此外，机组人员要进行清舱、配餐、确认行李架安全等工作，若有乘客在此时登机，会打乱工作节奏，影响航班正常起飞。

预留充足时间 

通常情况下，乘客办理登机手续、过安检以及从安检口走到登机口等环节需要耗费一定时间，提前半小时停止办理手续，是为了确保已办理手续的乘客有足够时间完成后续流程，避免因个别乘客迟到而耽误整个航班。 

温馨提示：乘坐飞机时，一般都会提前两个小时到达机场，更加从容的完成相关手续在登机口附近等待乘机。千万不要卡着时间点乘机哦机场很大的，卡点去机场可能会耽误乘机时间哦。

Do you have any questions like this? Why can't we check in even though there is still half an hour left? though we have already boarded the plane, the staff still have work to do before takeoff. For example:

 Ensuring flight safety 

The weight balance of the is crucial for flight safety. Before takeoff, the number of passengers, luggage weight, and fuel load need to be accurately calculated to ensure the aircraft's center gravity is within a safe range. If check-in procedures are conducted within half an hour before takeoff, the additional passengers and luggage could lead to errors in the calculations, increasing the flight risk. 

Ensuring work efficiency In the half-hour before takeoff, ground staff need to load luggage into the cargo hold according to weight distribution diagram. If new passengers board at this time, their luggage may need to be repositioned, consuming extra time and effort.

 Additionally, the flight needs to perform tasks such as clearing the cabin, distributing meals, and confirming the safety of the overhead bins. If passengers board at this time, it can disrupt work rhythm and affect the on-time departure of the flight. Allowing sufficient time In general, passengers need some time to check in, go through security, walk from the security checkpoint to the boarding gate. Stopping check-in procedures half an hour in advance ensures that passengers who have already checked in have enough time to the subsequent processes, avoiding delays for the entire flight due to a few late passengers. Warm reminder: When taking a flight, it is generally recommended to arrive at airport two hours in advance to calmly complete the relevant procedures and wait near the boarding gate. Do not try to make it just in time as the airport is very and rushing might cause you to miss your flight.