from
Mens JournalA few years ago, Timon van Basten, a travel blogger and tour guide in Spain, was searching for flights from Barcelona to Athens. The direct flight was oddly expensive, he recalls, so he plugged his route into a site called skiplagged and found out he could book a flight to Istanbul with a connection in Athens for roughly half the price. With just a carry-on bag in tow, he disembarked in Athens, never intending to board his connecting flight—or giving much thought to the fact that this was his first time engaging in a practice called skiplagging. It wouldn't be his last.
Not popular (!!) with the airlines.
Buying a return (day trip) on a channel ferry then going and not coming back has lead to a penalty in the past.
I have been told off for leaving a bus mid-route when I bought an end to end ticket which, it turns out, was cheaper
Rail tickets such as Megatrain and Advance Fares and not valid at intermediate stations
With most rail tickets, though, you are allowed to get off early or join late