File:Domestic US airline fare yields, 1955 and 1975.png
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This is never-copyrighted material. It is a graph from a document produced in the United States in 1976 without a copyright and thus public domain. See: https://en.wikipedia.org/wiki/File:Copyrightterm.pdf
The url link below takes you to the graph. The hdl link takes you to the front page in the same document - no copyright assertion on that or the next page.
Simat, Helliesen; Eichner, Inc. (January 1976). "Exhibit 6". An Analysis of the Intrastate Air Carrier Regulatory Forum (Report). Vol. 1. hdl:2027/ien.35556029279486.
 | This work is in the public domain because it was published in the United States between 1929 and 1977 inclusive, without a copyright notice. Unless the author has been dead for several years, it is not in the public domain in countries that do not apply the rule of the shorter term for US works. This includes Canada, China (not Hong Kong, Macao, or Taiwan Area), Germany, Mexico, Switzerland, and other countries with individual treaties. See also further explanation. |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:01, 5 August 2024 | | 1,995 × 1,504 (314 KB) | Enplaned (talk | contribs) | This is never-copyrighted material. It is a graph from a document produced in the United States in 1976 without a copyright. See: https://en.wikipedia.org/wiki/File:Copyrightterm.pdf The url link below takes you to the graph. The hdl link takes you to the front page in the same document - no copyright assertion on that or the next page. {{cite report|title=An Analysis of the Intrastate Air Carrier Regulatory Forum|author=Simat, Helliesen & Eichner, Inc.|date=January 1976|volume=1|section=Ex... |
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