The story
The airline was established on 20 January 1997 and started operations on 19 December of that same year as an affiliate of Japan Air System.
In November 2001, JAS announced it's merger with Japan Airlines. On April 30, 2005, Harlequin Air was integrated into Japan Airlines Domestic.
From Wikipedia’s article on Harlequin Air, shared under CC BY-SA 4.0.3