The plane ticket suddenly texted that it had been changed.

You can get it every time you pass by the airport. This is a scam message. Some scammers specially put a pseudo base station near the airport, and anyone who enters this coverage area can receive it. It's easy to intercept this scam message. Download a mobile phone housekeeper, keep it turned on, and you can automatically identify and help you intercept fraudulent text messages. Once intercepted, it must be a scam or harassing text messages.