Post: #1

http://video.pbs.org/video/1589184073/#

Post: #2

Mileage running. Done it a couple of times.

There is however a lot of work that goes into finding good fares and routes that allows you to accumulate the miles however. Not to mention the time it takes to actually sit on said flights.
In general I don't advice these kind of schemes unless you're flying on OPM.