Historical clue formulations

• Airing — 2025-08-31
• Being broadcast — 2024-06-17
• Airing — 2023-06-21
• See 31-Across — 2021-08-11
• Airing — 2020-10-12
• Where "Star Trek" and "Mission: Impossible" originated — 2019-10-17
• Airing — 2019-06-26
• Being broadcast — 2018-05-10
• Airing — 2018-01-20
• "As seen ___" — 2014-08-20
• Playing — 2013-10-13
• Airing — 2013-05-21
• Airing — 2012-10-02
• Airing — 2010-12-30
• Airing — 2009-01-26
• Widely seen — 2006-05-20
• "As seen ___" — 2006-02-23
• Airing — 2005-12-10
• Airing — 2004-04-07
• "As advertised ___!" — 2003-11-03
• How much advertising is done — 2003-03-01
• Airing — 2002-07-22
• How many a product is advertised — 2001-07-10
• Where to see "E.R." or "Ellen" — 1998-01-12
• Airing — 1997-11-30
• Airing — 1997-01-31
• Being broadcast — 1994-02-24