In BA promotion to SFO is after four years subject to having an unfrozen ATPL and showing up to an interview with a manager which is little more than an informal chat and a means to get you to visit the office at least once in your first four years in the company. You still get your annual incremental pay rise afer four years even if you don't meet the criteria, but promotion gets you a shiny third stripe and, mysteriously enough, an increase in your cabin entitlement should you be positioning on long haul.