My Airline:
4: Captain
3: First Officer.
2: Junior First Officer
1: Second Officer
We don't do augmented crew flights, so the SOs and JFOs are 'full' pilots in their own right. It's more a pay / administration / seniority thing.
Cathay pacific have 2 1/2 bard for FOs who are not cruise command qualified. Sounds daft, but it's to show that there is someone who can take over during the commander's rest period after an aircraft had to divert after it transpired that no FO could take over once they were airborne.
A management pilot in one airline I worked for seriously suggested that managers should wear 5 bars. He didn't take much banter for that!
