Originally Posted by Happy

That you can only receive the bonus from ONE airline, not each airline.

It must be new account, and for one time only. Although if you have sizable assets at Fidelity, you can get an exception for it. That can only be accomplished by calling, and if Fidelity agrees to make the exception, the rep would give you specific instructions on how to proceed. For new account you just need to follow the website instructions.

The best bang for the bucks is the $10,000 investment that gets 15K miles, imo.

Fidelity closed the loophole for both $100 cash bonus AND bonus miles. If this is the loophole you allude to.