Originally Posted by
alexanderrr
If she was tranisiting in FRA and her destination was outside of Schengen, then anything about validity of her visa is completely irrelevant. Timatic (system that most airlines use to determine when PAX needs visa) is quite clear -you do not need visa in this situation and you can not be denied boarding for that reason. After all, FRA is not some small airport that is closed overnight, so even if she would have a layover in FRA, she can stay airside for another night.
Actually Germany does require transit visas for citizens of certain countries. But I would be very surprised if Hong Kong is one of them.