Historical clue formulations

• Mount — 2020-10-23
• Board, as a plane — 2016-06-28
• Board — 2015-08-09
• Board — 2015-07-10
• "Hop aboard" — 2006-03-28
• Advance in age — 2002-05-08
• Board — 2002-04-28
• Board — 2002-04-21
• Mount — 2001-11-11
• Be friends (with) — 2001-08-15
• Age — 2001-01-28
• Mount — 1999-02-27
• Mount — 1994-05-09
• Mount — 1994-04-10
• Mount — 1994-02-11