Originally Posted by
LondonElite
Say you live in A and want to travel to B. You might find that C-A-B is much cheaper than A-B, so you buy C-A-B. The catch is that you actually have to start your journey in C. It's very widely discussed here on FT...
https://en.wikipedia.org/wiki/Airline_booking_ploys
"It's not illegal. It's frowned upon, like...
doing other things (edited for content) on an airplane."