My understanding is that operations make money, but congressional requirements to put away pension money beyond real necessity shoots off too much money. Anyway The “Post Office” can move in many directions. Reduce regular delivery to once a week. If you want to send that DVD slow, send it by media mail. Otherwise overnight it with FedEx or UPS. Eliminate the postal system as we know it, and contract all services to private businesses with a Postal Board overseeing contracts etc.
The Post Office is the only business in the country forced to fully finance pensions, going out decades. The law was a poison pill designed to kill it. Other companies will have their woefully underfunded pension obligations bailed out by the taxpayers.
You have absolutely NO IDEA how many American citizens live rural & cannot lose their mail delivery. I know of ranches in NE Nevada that have driveways 3 miles long-—the ranches exceed 6000 acres.