Yes, editing is not easy. First, all the video tracks must be synchronized. I use a specific event for this ( when the airplane taxies above a line painted on the ground ). I then take one reference track ( the one facing forward ) and cut it keeping in mind when I would like to have a change of the angle. I then cut all the other tracks at the same position and move the relevant segments to the final video track like a mosaic.
Putting only one camera sound track there should not be a big problem.