Home›Categories›Open QuestionsCategoriesOpen QuestionsCitation FormatsGeneral ReferenceGeneral Reference Citation TextTransport Atlas. "Open Questions." Accessed August 30, 2026. https://transport.interactiveatlas.org/categories/open-questions-index.Copy General ReferenceAPA StyleAPA Style Citation TextTransport Atlas. (n.d.). Open Questions. Retrieved August 30, 2026, from https://transport.interactiveatlas.org/categories/open-questions-indexCopy APA StyleBibTeXBibTeX Citation Text@misc{transportatlas-open-questions, author = {Transport Atlas}, title = {Open Questions}, year = {2026}, url = {https://transport.interactiveatlas.org/categories/open-questions-index}, note = {Accessed August 30, 2026} }Copy BibTeXReference and ClassificationDevelopingCross-Tradition ConnectionsComments (0)Reader Challenges (0 open reader challenges)Cross-Tradition ConnectionsContainsWas the Wright brothers December 1903 flight really the first powered, controlled flight of a heavier than air craft?, Open Questions Well-attested What counts as the first automobile: the Benz Patent Motorwagen, or an earlier self propelled road vehicle?, Open Questions Well-attested What happened to Amelia Earhart after her Lockheed Electra lost radio contact on 2 July 1937?, Open Questions Well-attested When was the Trans-Siberian Railway actually completed: 1904 or 1916?, Open Questions Well-attested Which airline is the world's oldest still in operation: KLM, Avianca through SCADTA, or Qantas?, Open Questions Well-attested Which civilization first built engineered, standardized long distance roads: Persia, Rome, or an earlier network?, Open Questions Well-attested Comments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0 open reader challenges)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.View At A Past YearThe atlas records no dated fact of its own for this entry, so there is no other year to choose.Show This Year