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Zip codes do not always speed air mail arrivals
An Associated Press analysis shows ZIP code usage yields inconsistent effects on delivery times. Across surveys from 1971 to 1973, average first class air mail times varied, with some cities improving and others not, and several letters arriving later than expected despite ZIP codes. Researchers note weekend service gaps and incomplete ZIP adoption as factors, while one in six letters still missed next day delivery in some cases.
MENTIONED IN THIS ARTICLE
U.S
Pytal
Sociated Press
Chicago
Tocal
Houston
Lletier
Echemsiat