For most people, ending up on a flight where you don't know the destination would mean you've been kidnapped by some sort of international people smuggling organisation.
Luckily, that's not the case for these 'mystery flights' that holidaymakers have been spotting on boards at airports.
The prospect of a mystery is always tantalising, the idea that you could board a plane and end up somewhere completely unexpected adding that special spice of adventure into the journey.
However, holidaymakers who didn't know about them have been left baffled when they've looked up at the airport departure board and seen the listing for a mystery flight.
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Both equal parts enticing and terrifying, perhaps your next flight could be a mystery one into the unknown.
Mystery flights are package holidays you can buy to a variety of unknown destinations where a series of events will be put on for adventurous flyers.
If you sign up for one of these breaks, the only clue as to your destination will be a suggestion of what to take with you.
Well, that and and also the travel itinerary they send you, but opening it before arrival would spoil the surprise and ruin the fun of the mystery.
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There are day trips, overnight stays and mystery holidays lasting a few days in an unknown location.
They've become popular across the world, with Australian airline Qantas recently relaunching the concept and teasing the idea of flights down to the Antarctic.
You'd hope in that case they'd give you plenty of advance warning to pack a coat and gloves for that particular trip.
Plenty of people were excited at the prospect of signing up for a mystery flight, and one person thought the whole thing would be better if it was a murder mystery experience held on a plane, which admittedly sounds like a lot of fun.
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Mystery flights are a thing in lots of other countries including the UK, though one woman's experience of them turned into a nightmare when her passport got stuck in the hold of the plane.
That mishap ended up delaying the entire flight as the ground crew had to fetch the bag and fish out the woman's passport in full view of everyone.
This isn't even a new idea, mystery flights used to be all the rage in the 90s where intrepid travellers would turn up at the airport and be put on an airline's scheduled flight.
Joe Harker