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Join Date: Apr 2001
Location: deep within the Eskimo lair
Programs: TubWorld, Bar Alliance, Borratxo Legendarium
Posts: 16,968
Even if the airllines travel benefits aren't based on seniority.. the shifts usually are. At my airline, part time shifts are pretty highly coveted, and only come after a few years with the company... and then you're looking at the most undesirable part time shifts for some time after that.
If by "on the side" you mean in addition to another full time job... you may have some difficulty even finding an airline that can accomodate you.