Any crew would want to be promoted to a higher rank in the company.Very few are contented to be just Flight Stewards or Stewardesses (FS or FSS).
In SQ one can go up from being a Stewardess/Steward to a Leading Stewardess/Steward (LSs or LS) then to be a Chief (CS/CSS) and an Inflight Supervisor(IFS or IFSs).From IFS one could be an AI (Inflight Auditor). An IA in reality is an IFS appointed for a term of 2 years and then revert back to be an IFS. It isn't in the management grade like the CCE (CT) which was made redundant in 2003.
The difference in salary (basic)between a FSS and an IFSs could be anywhere between $1,500 to $2,000 a month. The total difference in terms of allowances,basic,bonuses etc could average $3,000 to $4,000 a month.In other words, an IFSs could take home about $7,000 and a FSS $3,500 per month. So which crew would not want to be promoted?
A graduate Cabin Crew Executive or CCE (non-flying) with a 2nd upper Honours starts with about $3,500. An "O" level Fss/Fs starts with with the same salary (inclusive of all sorts of allowances). No wonder so many wanna join SQ as a cabin crew.
To go up to the first level of promotion from a FSS/FS to LS/LS it would take about 5 years. There were times when there was a severe shortage of cabin crew and coupled with rapid expansion, it took about 3 years to be promoted to LSS/LS. In the early 1970s, cabin crew serving 3 to 6 months had been promoted. I remember 2 stewards by the name of C. H. and Ho were promoted to the LS rank even before being confirmed in their position as FS.
For a cabin crew to reach the position of an IFS,it would take about 15 years.
Nowadays,there is almost zero chance of any crew holding an "O" level education or Diploma making it to the CCE rank (CCE now works in the office). This position is for 2nd upper and higher only. Although a CCE starts with a $3,500 salary their prospects of being a manager is good. A junior manager probably gets a salary of around $7,000 to $10,000. A senior manager gets around $12,000 depending on length of service and the number of merit increments they obtained each year. SVP would score anything from $20,000 to $40,000 a month.
PS: the above salary figures are from my own assessment and may not be necessarily accurate. Managers and more senior staff salaries are kept confidential.