I do not know if you are aware, but there has been an ethical debate for a long time as to whether or not it is acceptable to lean back in an airplane. In this debate, Delta seems to have taken sides, since they have announced that they will restrict the number of seats, hoping to reduce "conflicts among passengers," according to a travel expert. .
This travel expert is Scott Mayerowitz, running The points guy He reports that as of Saturday, Delta's Airbus A320 fleet will reduce the tilt of four-to-two-inch coach seats and first-class seats from five and a half inches to three and a half inches.
Delta is keen to point out that this is not an attempt to make more money by bulking up more seats on the plane. Ekrem Dimbiloglu, Delta's product and customer experience manager, told Mayerowitz:
"We do not add a seat on the plane … It's really not a bridge to reduce your legroom. This is not the intention here. If we added seats or something else, the cynics would be right. But it's really more personal space.
It should be noted that conflicts related to the inclination of the seats are a real problem, so much so that real products are available to allow people to disable the tilt on the seat in front of them.
In fact, the Air Passengers Association (APEX) even went so far as to do an infographic on the reclining seats label:
I have to say, I think that's fine with me. I have almost never inclined my seat, because I do not feel, well, as if I were worth it. Why should I fly space to the person behind me, moving the screen of his seat to a weird angle or typing on his laptop? What am I, a sultan? It's just not worth it, and it never helped me.
According to Delta, the change on the A320s is a kind of test and, pending feedback and feedback from customers, they will decide whether or not to extend these changes to their entire national fleet. International flights should not be affected.