Aside from the main airline ticket, the boarding pass is another important requirement needed for all travellers before getting inside the airplane.
If you're like me or most of us who would just throw it away after the flight stewardess checked on it. Please do not do it from now on. We are giving hackers the free access of our personal information, that they might use to hack our bank accounts or what else.
Using even just using smartphone with a special app that can look into barcodes. These apps can only be downloaded online. So anyone is a potential hacker.
I search the web to confirm this, and NBC News has a news report about this.
Watch USA Today's video about this.