Liked the episode a lot!
It was kind of heartbreaking to see a burning Los Angeles because I just love that place so much.
But it was a great opening nevertheless.
I believe that "Jack" might be part of a military ship that's hunting down small ships, kind of in the same spirit as they did in the first season. I can't remember why they did it, but I guess it's to prevent the virus from spreading. It's been a while, I'm not sure. But I'm certain the military did this and Jack is either part of it or trying to hide.