總之，要想在退機票的時候不收手續費，需要滿足一定的條件。在購票前，大家可以仔細閱讀航空公司的退改簽政策，了解自己的權利和義務。如果遇到需要退票的情況，及時與航空公司聯系，按照要求提供相關材料，爭取獲得免費退票的機會。希望大家的出行都能順利愉快！

Airline reasons

1. Flight cancelationif the airline cancels your flight voluntarily, you have the right to request a free refund or change of ticket. In this case, the airline will notify you by text message, email, etc. , and provide you with the corresponding solution. 

2. Flight delay when the flight delay reaches a certain time, the specific time according to the provisions of different airlines, you can also apply for a free refund. In general, consider this option if your flight is delayed for more than a few hours or more, severely affecting your travel plans.

 Individual Special Circumstances 

1. If you have an illness before the flight, can not take the flight, you can provide hospital diagnosis and other related materials, to the airline for free refund. Note, however, that different airlines may have different requirements for the type and severity of the disease. 

2. If your immediate family member (e.g. parent, spouse, child) is seriously ill or has died, you need to provide relevant documents such as medical records, death certificates, etc. , the airline usually allows you to refund your ticket free of charge.

 Other circumstances 

1. Special passengers for some special passengers, such as unaccompanied children, pregnant women, people with disabilities, in accordance with certain conditions can be free refund or rescheduled. Specific policies can be consulted airline customer service.

 2. Force Majeure factors such as natural disasters, war, terrorist attacks and other force majeure factors, resulting in flights can not operate normally, airlines will generally allow free refund.