All airlines, charter outfits, etc. are stepping stones to the BIG ONE. It appears that the smaller airlines like Link and 1time are larger stepping stones across the treacherous pond, and need the likes of a Solidarity. A quick-fix-for-now, sort-the-pension-out-later type! Larger airlines (in the Safrican context) are smaller stepping stones to the BIG ONE, and seem to do well with ALPA-SA.
Use the union that fluffs out your tail feathers, but don't forget that it's your choice at the end of the year! May your stones not be too slippery....and remember, stones can be treated with beer!