I was checking in for my Sunexpress flight when all of a sudden it said Sunexpress 'element not found'. What is this?

The "Sunexpress 'element not found" message that popped up when you checked in most likely denotes a website bug for Sunexpress. An issue with the website's coding, such as a missing button, text, or image on the check-in page, is typically the cause of this error. Another reason could be a brief outage that affected Sunexpress's online systems.

You can try visiting the check-in page again after a few minutes to see if this fixes the issue; generally, these bugs go away on their own. As an alternative, see if Sunexpress has a mobile app for check-in, or search their website or social media pages for details on additional check-in choices, such as airport kiosks. For assistance, get in touch with Sunexpress customer service if the issue continues. They can offer different ways to check in or assist with problem-solving.