Old phone numbers in the U.S. had letters to denote the telephone exchange that handled any given number, a practice that lasted until the late 1970s.

Ever wonder what all those different codes on your boarding pass represent? Here's how to find your booking code, flight number, and more.

If you have trouble remembering long numbers—like phone numbers—Redditor Fealiks shares a simple way to keep everything straight. All you need to do is assign the numbers to letters, and ...