I've accomplished all the goals on this level but have no idea how to get the bonus so I can get the gold. Can someone give me a hint how to get the bonus???
Thanks
Fly around the very edges pf the city, until you come across a lone AT-ST shooting at 3 narrow towers. Kill the AT-ST and out comes the powerup.
The AT-ST is on the opposite side of the city as the train. If you keep going you'll see it.