FWIW, I could never do the job of a flight attendant. More than likely you will not get a job at a major, it will be at a regional. The pay is deplorable, and you will not have much time off. You will not have time to pick up CFI work consistently, which is the most important part of being a CFI. Your schedule will vary month to month and you'll see changes in it as well. And that's if you're not on reserve.
While it sounds fairly reasonable at first, it isn't. And if makes a difference, I considered this same thing about 12 years ago.