At work, flight attendants need to abide by the airline's work regulations and professional ethics. These regulations usually require flight attendants to communicate with passengers in a professional and polite way to avoid any behavior that may cause passengers discomfort or violate professional ethics. Therefore, if a flight attendant wants to establish personal contact with passengers through WeChat, or leave personal contact information for passengers, it is usually not allowed, because this may be regarded as a violation of work regulations and professional ethics.
However, if the stewardess wants WeChat to provide service information for passengers or handle emergencies, such as communicating with passengers or providing help during the flight, then this behavior may be reasonable. In this case, flight attendants should abide by the airline's work regulations and professional ethics to ensure that their actions will not cause passengers' dissatisfaction or discomfort.
In short, whether the stewardess wants WeChat to violate the rules depends on the specific situation and the airline's work regulations. If stewardesses' behavior may be regarded as violating work regulations or professional ethics, they may face disciplinary action or other consequences.