Hi Stewart,
thank you for kind words! Your code works fine on the wix side. My guess is that their scanning tool does not detect it because it is in an iframe. Could it be the case?
Also, do you know any sites with that snippet built with wix? If so, could you please post the address? And if not, I think what you could do is contacting the flyairlink.com and asking about scanning iframes. Maybe even if they do not support iframes, they could verify it manually?
kind regards,
Marius