Originally Posted by
PRS Guitars
I have to disagree with PA slammer's advice. Just look at what has happened to guys who got a CJO from AA in Oct 2014. Most of them, and all who were offered a CJO after that are still waiting for a class date. If a world event causes hiring to stop (like 911), their CJO will likely never be honored. Now if you already have a class date lined up, you're probably good to go. You could even ask airline B to push your interview back a bit.
BTW, if you base your decision on "if a world event happens", you'll never take the necessary chances to make anything happen.