A union isn't inherently bad. It can be a good thing. The danger lies when the union is born in an environment where the union seeks to advance it’s own short term wants over the long term viability of the company—“to kill the Goose” analogy.
If the union is founded to provide benefits and make small improvements to QoL, it will do great. If it’s founded to right past “wrongs” in a take-no-prisoners, restore the profession mentality they will kill the company. Based on the wildly unscientific sample of Jet Blue folks I know, my guess is the former, with only a small, very vocal minority advocating the latter.
Just be glad you can vote secretly—at least for now. Card check elections are coming. Imagine the post election environment when everyone’s vote—no matter what the outcome—is public knowledge. Imagine how the union, no, make that the small, very vocal minority would treat the folks who voted no.