Historical clue formulations

• Like June 21 among all the days of the year — 2025-11-11
• Nile superlative — 2025-01-10
• Like the flight from New York to Singapore, among all actively operating passenger flights — 2024-11-03
• Like "Cleopatra," among all Best Picture nominees — 2020-09-30
• Like the papacy of Pius IX, after St. Peter — 2016-06-24
• Guinness superlative — 2014-06-12
• Like the day of the summer solstice — 2011-08-28
• Adjective for 17-Across — 2004-05-26
• Most extended — 1996-05-20