Virgin 747 400 series question
I flew back from Vegas on Thursday on a Virgin 747 400 series and to my surpise it seemed a bit old, there was no on demand Tv (which is only a little thing) but most concerning was take off. When we was just leaving the ground there was a massive virbration and everything was shaking and making a loud noise. i was sitting just at side of the wing and have sat here before but no known such a vibration, what was it, any ideas?