What i would like to know is:

Why is the flight changed to a 747?

The background is the following:
It's the first time i'm going to fly VS and i already had some serious problems with the online check-in. My first thoughts were that something with my browser went wrong but when going on with the check-in the problems kept on coming.

My original booked seats were gone, i couldn't enter the Virgin Club and the worst of all: No A 346...

So this is why i had to ask some of you experts. Would be really great if someone has some more information.

Thanks
Flyable