. >> "america tonight," sarah ho,wh yorvetion join yjoins us. is this very important? >> yes, because passengers boarded flights a million times without their documents being proper reply examined. this has been a problem for years, and only ahandful of airlines are checking for these lost or stolen documents. if you add that up, with this database it was searched about 800 million times joie, but only 1 search was conducted by the united arab emirates alone. this is a problem. >> wouldn't there be a computerized system to be able to check this all over the world? >> that's the question, being asked with the plane itself, where is the plane and why can't we find it? >> thank you, "america tonight"'s correspondent sarah hoy. >> you have seen this many times before. i think for those of us who are laymen you would think, an disappear? >> it is a mystery. it reminds us of the air france disaster, flying over the atlantic. it took a long time to find wreckage and what happened to it. we have this plane, missing, on radar coverage. in that area there is no radar coverage un

"america tonight"'s correspondent sarah ho hoy has the story. >> the bitcoin largest exchange where hackers made off with currency valued add $360 billion, mountgox has since filed for bankruptcy. it's ceo appeared before japanese media. bouging bow many for several minutes. >> looks the like that's disappeared. >> colin burgess traveled 6,000 miles to tokyo to find out where his money was. >> i'm annoyed. it seems like i've lost all my money. i'm annoyed that the company has bee been stringing people along for so long claiming everything is okay. >> a bitcoin bank went belly up . stealing 900 bitcoins, worth $6 $600,000. >> for the currency curious, bitcoins are are digital currency traded online and are free of regulation. bitcoins are lines of heavily encrypted computer code. with a fixed number of bitcoins available, their value fluctuate. put your value at your own risk. technology. there is a lot of possibilities with it, a lot of challenges and a lot of things that are to be learned about it yet. >> you buy bitcoins with real money. usually through an exchange. then you can use the v