AirBus331--from many conversations with many of those who have come over to jetBlue from US Air, I'd say that the vast majority believe it to be a great place to work. Some of them were furloughed, but others "saw the writing on the wall" for their immediate futures and came over before losing their jobs. Are they content? I think so. Are they happy about switching jobs? Dunno. They are obviously in turmoil at having X number of years with US Air taken away from them--upheaval is difficult to handle, even with an excellent alternate in the offing.
That being said, despite being a relatively young whippersnapper on the block, you would very likely love JB. The work environment is top notch, and 98% of the folks I fly with are extremely positive about what we are doing and how it's getting done. I've had the jB president ride my jumpseat on several ocassions; every time he has answered my many questions directly, and every time he has asked for our opinion on what we could do better to make the company prosper. How often does that happen in this industry?
Despite the likely flaming I'll get on this next opinion, I'll make it anyway. Coming from a slightly different background, I don't believe it appropriate to take advantage of one company to play against another. Loyalty is important in my book. That being said, you are free (as we all are) to take Typhoonpilot's advice and take leave to seek employment with jetBlue for a couple of years while you wait for US Air to settle out and potentially go back.
IMHO, that is wrong...
JetBlue will spend considerable time and resources to train you. As a small airline, it causes measurable harm for the company to loose a pilot. To lose one due to a desire for personal gain at the expense of a company trying to "make it" in today's environment is not the right thing to do. In my mind, if you were to take a job with jetBlue with the full intent of returning to US Air after things settle out you would be taking advantage of a great job with a superb company. Is it OK to do so? Let your conscience be your guide, but I don't think so.
The other side? Well, I don't have 16 years invested in US Air, so I don't know what emotional and financial investment you have with them. That's an important factor that I can't quantify.
You will get many contrary opinions to mine. The move from US Air (or any other airline) to jB is not like a move from a commuter to a major; jB will be a major late next year or early in 04, and has a temendous record (and potential) for growth and profitability. In short, I guess I don't see jB as a "stepping stone," as much as a final destination.
In any case, if and when you do decide to interview with jB, best of luck! You'll see a bunch of fine folks trying to make it in a tough environment--just like all of us.