Historical clue formulations

• Close one — 2019-05-14
• "Whew!" elicitor — 2018-09-23
• Aviation safety statistic — 2013-08-16
• Aviation safety statistic — 2013-06-01
• *Failure by a narrow margin — 2010-10-05
• Close call — 2010-06-08
• Close call — 2005-02-27
• "Almost" — 2003-08-23
• Close one — 2002-12-06