Historical clue formulations

• Salt, at times — 2024-02-29
• Winter airplane need — 2020-10-09
• Wintertime airport supply — 2014-04-02
• Ethylene glycol product — 2006-03-04
• Salt, sometimes — 2005-10-28
• Windshield clearer — 1999-05-25
• Salt, e.g. — 1998-06-29