India, June 27 -- With summer travel reaching its peak, a rising number of airline passengers are finding themselves stranded at airports despite holding confirmed tickets.

New research cited by the Daily Mail reveals that more than 6 million travellers are denied boarding each year due to overbooking, a practice where airlines sell more tickets than available seats, anticipating that some passengers will not show up. When that gamble fails, it's the passengers who pay the price.

Go.Compare looked at data from the UK's Civil Aviation Authority (CAA) and found that over 20 million travelers are affected by overbooked flights each year. Of those, nearly a third-about 6.6 million-are completely denied boarding.

As per law, the airlines ha...