There are sites online such as, Online Barcode Reader that can interpret data on your boarding pass. Sites like this one can interpret all sorts of data, from your name and telephone number, to your frequent flyer number and schedule of flights.
Ravenscraft mentions that while ‘of course, every airline has a different method for storing information on their boarding passes. Even without encoded information, the data that’s plainly visible on your boarding pass should make it worth shredding.’
Do you throw away your boarding pass or shred it? Perhaps it’s worth reconsidering how you dispose of your boarding pass.
Brian Krebs, Krebs Security
Eric Ravenscraft Lifehacker.com