I believe the USPS changed the name of 4th class parcel post to Standard Mail B, though many still refer to it the old way. When I shipped a package International not long ago, the choices were Global Priority, 4-6 days, Airmail Parcel Post, 4-10 days and Economy (Surface) 4-6 weeks. I don't recall any 4th Class/Standard Mail B choices, but 4th class was always surface.
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