All 2658 WP:Aviation categories affected by Wikipedia:Categories for discussion/Log/2019 April 19#Category:Aircraft piston engines 1900–1909:
These did not show up initially because they are (were) missing a {{ WikiProject Aviation}} tag, and were found by fully recursing Category:Aircraft by type. Ping to closing admin Timrollpickering. ~ Tom.Reding ( talk ⋅ dgaf) 19:35, 8 May 2019 (UTC)
All 2658 WP:Aviation categories affected by Wikipedia:Categories for discussion/Log/2019 April 19#Category:Aircraft piston engines 1900–1909:
These did not show up initially because they are (were) missing a {{ WikiProject Aviation}} tag, and were found by fully recursing Category:Aircraft by type. Ping to closing admin Timrollpickering. ~ Tom.Reding ( talk ⋅ dgaf) 19:35, 8 May 2019 (UTC)