United just added a top-tier perk no other airline has
This ought to give Delta something to worry about.

Flying offers an essential service for millions of people who prefer it to slower forms of travel. But unless you can afford first class, no one can say that the experience of flying is a comfortable one.
Airplanes used to be much roomier in the '60s, but as the decades went on, airlines seized the opportunity to reduce that room to fit more passengers on flights. This is why it's nigh impossible to fly these days without rubbing against your seatmate's arm.