You can even switch seats.
If you plan to fly Delta this holiday season, you may want to double check your boarding pass.
As one of my BuzzFeed colleagues recently discovered, a security vulnerability on Delta Airlines' website allows anyone with a valid boarding pass to access the boarding pass of another traveler, simply by switching the numbers in the URL.
To prove it, my colleague sent me the URL of an old Delta boarding pass, which looks like this:
After tweaking one number in the URL, I refreshed the page and found a new boarding pass — with the passenger's full information, including his frequent flyer number.