You plan your vacation carefully, choose each attraction you visit, the restaurants you want to visit, and even plan with friends and family. When the day of travel comes, just close your bags - while they still close, because it won't be that easy on the way back! - and leave for the airport.

But then you arrive at your destination and realize that what you feared most happened: the airline lost your luggage. And you know what's worse? This is more common than you might imagine. So here are ten things you need to know about lost luggage:

1. The total number of baggage lost, delayed or damaged by airlines worldwide fell 17% in 2013 - resulting in about 22 million. But as air travel increased by 5% last year, the overall lost baggage rate dropped 21% - corresponding to seven lost bags per 1, 000 passengers;

2. Of all lost luggage, 81% are simply late, 16% have been damaged or stolen and only 3% are declared lost or stolen - and they are never really found;

3. The cost for airlines to locate, deliver or refund lost luggage was $ 2.09 billion in 2013 - a 20% drop from 2012;

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4. The main reason for arriving late is due to the error of the porters when transferring luggage from one plane to another. This is the cause of 45% of lost bags;

5. The year that lost most in the last decade was 2007, when companies lost 47 million bags. The rate was approximately 19 lost luggage per thousand passengers;

6. Since 2007, the lost luggage rate has dropped to approximately 63%;

7. Airlines operating in Asia have the lowest lost luggage rates - about two out of every 1, 000 passengers. In North America there are three lost luggage per thousand passengers;

8. In 2013, companies took an average of 36 hours to return their late bags to their owners;

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9. Airlines around the world earn about $ 10 billion from checked baggage, but spend about $ 31 billion to transport them from airport to airport;

10. By the end of 2016, over 60% of airlines expect to be able to send passengers luggage notification and thus allow them to report possible missteps via smartphones.

All the information was revealed from a study by SITA - a multinational specializing in services for the aviation industry.