Have an extended layover coming up in the US or Canada? Still wanting to explore some tourist spots in North America? This post shows that you can still see tourist places in North America even within a short period of time, which makes the layover a great luxury travel hack.
Exploring Europe during long layover flights is a great way to see those extra cities. Maybe you are worried you may never ever make it back to Europe or that particular city? So, if you have at least a 6-hour layover (maybe even 5 hours if you are feeling game) and visa requirements allow why not leave the airport and enjoy a new city.