Only 38% of first-class mail was delivered on-time at the end of 2020, the Postal Service reported in federal court.WASHINGTON - Postmaster General Louis DeJoy is preparing to put all first-class mail onto a single delivery track, according to two people briefed on his strategic plan for the U.S. Postal Service, a move that would mean slower and more costly delivery for both consumers and commercial mailers.DeJoy, with the backing of the agency’s bipartisan but Trump-appointed governing board, has discussed plans to eliminate a tier of first-class mail — letters, bills and other...…Only 38% of first-class mail was delivered on-time at the end of 2020, the Postal Service reported in federal court.WASHINGTON - Postmaster General Louis DeJoy is preparing to put all first-class mail onto a single delivery track, according to two people briefed on his strategic plan for the U.S. Postal Service, a move that would mean slower and more costly delivery for both consumers and commercial mailers.DeJoy, with the backing of the agency’s bipartisan but Trump-appointed governing board, has discussed plans to eliminate a tier of first-class mail — letters, bills and other...WW…