Other Intune-related topics, including unsupported scenarios and platform-specific behaviors
@Daniel Bulakh, Thanks for posting in Q&A. Based on my testing, I find the Microsoft Entra user will be able to log in to Windows without internet connection if the device is Microsoft Entra joined and the user has already login previously. Based on my researching, the user's credentials will be cached on the device for up to 14 days, and they will be able to log in without an internet connection.
However, If the user is experiencing issues to login, they can connect to the airport WiFi prior to boarding the plane to ensure their credentials are cached.
Hope the above information can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.