As an FO (Co-Pilot) there is almost no representation.
At Pan Am, we had a separate union for FE's (Flight Engineers). Some other airlines called them SO's.
The old Senior Guy's (Capt's) have always pushed for revocation of the 60 age rule. The Junior guys had to put up with no "up" movement until these Seniors retired.
Now, again, they want more Cake.
Tell you what, tell your Third ex-wife to stuff it