Historical clue formulations

• Carnival transport — 2018-12-01
• Luxury craft crossing the Atlantic, say — 2012-08-13
• Queen Mary, for one — 2012-03-09
• The United States, for one — 2008-11-29
• Choice for intercontinental travel — 2008-03-21
• Cabin locale — 2006-10-06
• 17-Across, for one — 2004-05-26
• QE 2, e.g. — 1996-01-08