Originally Posted by FlyUK
What, the ones who do EXACTLY the same SEP training as the more 'Senior Crew'
At BA and quite a few other airlines...
4 - Captain (not necessarily PIC)
3 - SFO
2 - FO
1 - Not used anymore.
P.s THEY ARE PLATINUM!

Just to add that whatever their background pilots join BA as an FO with two stripes (there are odd exceptions). Direct Entry Pilots who have been Captains in other airlines or fast jet pilots in the RAF etc all join as two stripe FO's. After four years as an FO, assuming you have an ATPL, there is an interview to upgrade to Senior FO.
Recent exceptions include Captains from airlines merged into BA who kept their rank.