Not all careers are conducive to daily spiritual advancement and warfare, so keep this in mind. In an ideal world, all career paths would be supportive of those who wish to do daily advancement as well, but unfortunately, this is not the case.
Many airline crews have to work odd or long hours, factoring in delays and other inconveniences Perhaps this can be avoided through specific careers paths in aviation, but this requires extra effort.
Personally, I believe SS should put their advancement first, and career paths second. There is no way a career will be more fulfilling in any aspect compared to spiritual advancement. In addition, one can do workings to change their interests, or change their position within a company, or whatever. Therefore, focus on advancement first.