WASHINGTON, June 1 -- United Parcel Service Co., based in Louisville, Kentucky, has voiced concerns to the U.S. Department of Transportation regarding a proposed rule that would mandate inspections for certain Boeing 757 aircraft. The airline contends that the proposed general visual inspection of engine strut components is redundant due to existing maintenance protocols. David Springer, Senior Director of Engineering for United Parcel Service Company, stated in a letter dated May 14, 2025, tha  more