By 1915, air-to-ground radio was in use by reconnaissance pilots during World War I.
Notes on verification
Confirmed by multiple independent historical sources including Marconi Heritage, FirstWorldWar.com, WarHistory.org, and an academic encyclopedia entry, all corroborating wireless transmitters aboard aircraft for artillery spotting by 1915. [tier=unverified indep_score=0.3 clusters=4 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- Aerial reconnaissance in World War I (wikipedia)
- https://www.firstworldwar.com/airwar/observation.htm (corroboration)
- https://warhistory.org/article/wwi-spotting-for-the-armys-big-guns-i (corroboration)
- https://marconiheritage.org/ww1-air.html (corroboration)
- https://encyclopedia.1914-1918-online.net/article/wireless-telegraphy/ (corroboration)