Just when you thought snail mail or "traditional" mail, as it is now called, was getting old, Japan had to go ahead and start using Flying Letter mail as a way to spice up the old letter-writing past time. Most Gen Y and certainly all Gen Z'ers don't even know where to find the physical entity known as the mailbox in their neighborhoods, so this play on the past will provide a fun and creative way to dabble with real letter writing with a real pen.
The letter paper does not allow much room for writing, but it's the mile high thought that counts, right? While the practical use of this does seem quite limited, so are the use of paper planes in general. The Flying Letter is a throwback to childhood and a fun way to launch your mind into a retro letter writing mood.