I guess I'll be the sole "other" opinion here. If you're already on base on the equipment you want to be on, why upset the apple cart? I know several people who have jumped from airline to airline numerous times because the grass is greener, and they are worse off than if they had just stayed at the first major airline they were at. Starting over at the bottom of a huge list is risky, and we can't always assume that things will not change with the hiring climate. What if the music stops (or goes backwards) 6 months after you jump ship?

I'm not saying any of that to dissuade you. By all means go where you'll be happy. I just don't think that it is as much of a "no brainer" as people seem to think.

I say go to the interview, and see how it goes. If you like the company, and get a good feeling about it, go from there. But take it seriously and weigh all of the pros/cons and don't cheat yourself out of making a critical decision by just assuming that the grass is greener.