Is it okay to recline your seat on a plane?

The seat is designed to recline, provided you do it slowly and considerately.

You paid for the seat's full function, and reclining within the provided range is a normal, fair use of your space.

Reclining is a standard design feature intended to help passengers rest comfortably during flights.

You paid for a reclining seat, and using that built-in function is a normal, fair part of flying.