No it doesn't, nowhere does it say that.
SkySolver and Crew Web Access, look “historic like they were designed on Windows 95”. The fact that they are also available as mobile applications should further make it clear that no, these applications are not running on Windows 3.1 or Windows 95.
Yes, yes it is if you run bitlocker with external verification.
It's even harder if the server you use for the verification itself is down.