Thanks for the responses I’m still trying to rap my head around the seniority system so bear with me.
My understanding is as soon as you join you get assigned a number which is obviously your seniority.
This number changes as time passes because you have worked in the company for a specific period. Once your freeze is over (unless the company decide to unfreeze you earlier) and if you match the required “number” you can then advance onto a new aircraft type or LHS. Once you make this move, your seniority “resets” to the bottom and you get frozen again for a period between 1 to 8 years (1 for command) and now need to just keep waiting until the number reaches whatever it is you want to do next (rinse and repeat).
Is this somewhat correct?