keep in mind, that firing someone costs about 5.5 to 6 times the standard (not the average) national salary. so it's usually less expensive to just keep them until you sign additional interlining agreements. also, the number of required network planners depends on your own size as well, so as long as you keep in growing and you have at least one IL, the number of required network planners will increase.
same for pilots, etc.
and I just fired two of my poor redundant employees..
a network planner for $5400 and a cargo controller for $3360.
$50K should not sink a company in this game but it would be nice to know the impact of your decisions.
My lowest I have ever had in a bank account without getting to bankruptcy was AS$7k so 50k could have easily killed me though the game can will not allow you more than what you have in your bank account anyways.