What should I do if the flight number changes when applying for a NON-O family visa in Thailand?

When applying for the NON-O family visa for Thailand, it's common to worry about providing a flight number, especially if travel details might change. Commenters suggest that it's acceptable to give a potential flight number even if tickets aren't purchased yet and that proof of a flight is rarely requested. As long as you arrive in Thailand within 90 days of receiving the visa, any changes in flight details should not pose an issue.