^^ Whatever title they're giving to you...be it SO, JFO, FO or whatever:
The FAQs told us to expect a JFO salary from 1st Line Check to 15ooh; when in fact you get an SO salary to 5ooh, thereafter (J)FO to 15oo, thereafter SFO salary to Captain. So after your first Line Check expect to be on your training salary for quite a while and thereafter on a SO salary.