Historical clue formulations

• Goodyear aircraft — 2023-12-25
• Goodyear airships — 2023-12-11
• Hoverers over sports stadiums — 2009-02-23
• Sights at many football games — 2005-06-04
• They may pull banners — 2001-12-15
• Ad sites at ball games — 2000-05-13
• Goodyear fleet — 1997-04-01