大家又沒有這樣的疑惑？為什么明明還有半個多小時，卻不可以辦理值機手續了？即使我們已經乘機，但是在起飛前工作人員還有工作要做。例如： 

保障飛行安全 

飛機的載重平衡對飛行安全至關重要，起飛前需要精確計算乘客人數、行李重量和燃油載荷等，以確定飛機的重心是否在安全范圍內。如果在起飛前半小時還辦理手續，新增的乘客及行李可能導致平衡計算失誤，增加飛行風險。 

確保工作效率 

起飛前半小時，地勤人員需按載重平衡圖將行李裝到貨倉，若此時有新乘客登機，其行李可能需要重新安排裝運位置，耗費額外時間和人力。此外，機組人員要進行清艙、配餐、確認行李架安全等工作，若有乘客在此時登機，會打亂工作節奏，影響航班正常起飛。

預留充足時間 

通常情況下，乘客辦理登機手續、過安檢以及從安檢口走到登機口等環節需要耗費一定時間，提前半小時停止辦理手續，是為了確保已辦理手續的乘客有足夠時間完成后續流程，避免因個別乘客遲到而耽誤整個航班。 

溫馨提示：乘坐飛機時，一般都會提前兩個小時到達機場，更加從容的完成相關手續在登機口附近等待乘機。千萬不要卡著時間點乘機哦機場很大的，卡點去機場可能會耽誤乘機時間哦。

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.