India, April 9 -- Earlier this month, a Scandinavian Airlines (SAS) flight took off from Copenhagen to 'Destination Unknown.' Part of the airline's Destination Unknown concept, the mystery flight was open exclusively to the airline's EuroBonus loyalty programme members.

Travellers had no clue where they were heading, other than knowing the destination was somewhere within the Schengen zone. Even Flightradar24 was kept in the dark, preserving the surprise until the very last minute.

Scandinavian Airlines' Destination Unknown is a concept designed for adventurous travellers. The airline does not disclose its destination in advance. Instead, members of its EuroBonus frequent flyer programme can use their points to book tickets for a flight...