Historical clue formulations

• Vent opening? — 2026-09-10
• Historic introduction? — 2026-06-30
• Opposite of post- — 2026-06-08
• Lead-in to natal or nuptial — 2026-03-09
• Lead-in to determined or destined — 2026-03-05
• Lead-in to Check on a boarding pass — 2026-01-28
• Lead-in to fix or text — 2025-06-14
• Lead-in to approval — 2025-02-09
• What follows T.S.A., weirdly — 2025-01-16
• Before — 2024-12-14
• Lead-in to Check — 2024-11-22
• Lead-in to algebra or calculus — 2024-08-27
• Lead-in to law or launch — 2024-08-26
• Lead-in to boarding — 2024-07-04
• ___-Columbian (up to 1492) — 2024-03-11
• Start to fix? — 2024-02-08
• ___-owned (merchandise designation) — 2024-02-07
• Grand ___, town in Nova Scotia that's a UNESCO World Heritage Site — 2024-01-19
• Lead-in to season — 2023-12-21
• Intro to calculus? — 2023-11-08
• Opposite of post- — 2023-10-17
• Opposite of post- — 2023-07-24
• T.S.A.-offered program, familiarly — 2023-06-04
• Intro to cognition — 2022-12-30
• Lead-in to position or occupation — 2022-11-01
• Lead-in to K — 2022-10-14
• Lead-in to fix or fabricate — 2022-09-19
• Lead-in to historic — 2022-05-29
• Qualifying match, for short / Big name in antifreeze and brake fluid — 2022-05-22
• Opposite of post- — 2022-01-16
• Opposite of post- — 2021-07-13
• Occupied leader? — 2021-06-26
• Lead-in to calculus — 2021-02-16
• Line-skipping option at the airport, for short — 2020-08-07
• ___-K (early learning) — 2020-06-01
• Canada's Grand-___ National Historic Site — 2020-05-21
• ___Check (T.S.A. convenience) — 2020-02-10
• Prefix with caution or condition — 2020-02-06
• Air traveler's convenience, informally — 2019-04-18
• Season opener? — 2019-02-22
• Lead-in to occupy — 2018-12-03
• School opening? — 2018-07-29
• Lead-in to K — 2018-07-26
• ___-K — 2018-07-04
• ___-K (tot's class) — 2018-07-03
• Lead-in to screening — 2018-05-30
• School commencement? — 2017-12-27
• Nova Scotia's Grand ___ National Historic Site — 2017-08-04
• ___-K (early schooling) — 2017-05-29
• Lead-in to historic — 2017-02-20