Article 16.3, Suspensions in the contract. An employee who has been disciplined with a 14-day paper suspension will be given a day of reflection, provided it is agreeable to the Union. It is a paid non-duty status for one scheduled work day. For the employee to consider the actions which led to that point, the seriousness of the offense(s) and how close he is to being fired. Etc.
What qualifies? It's a paid day off, DACA code 4, applicable to regulars only, precipitated by the issuance of a 14 day. Prior to the Day of Reflection there is a meeting held with the carrier, Management and the Union to discuss the issues of why the Day of Reflection is needed (usually the charges laid out in the 14 Day).
Days of Reflection are almost always granted at the insistence (notification) of the Union; Management is not going to give an employee a free day unless 16.3 is exercised.
FYI RCAs are not entitled to a day of reflection but don’t let that stop a steward from asking for one so that that RCA gets a paid day off. A lot of times management doesn’t have a clue that RCAs don’t get one.