Each of us knows, deep down inside where we converse only with ourselves and can't rationalize, what is right and what is wrong. Whether it's money on the street, extra change at the grocery store, bank errors, payroll errors, or airline errors, I think we all know what the real "right" thing to do is. I am happy to hear that there are so many honest people out there. I hope that I can emulate you when I'm in a similar situation.
PS: "legal" and "right" are often different.
-just my two cents..thanks