Just thought how strange my behaviour is when it comes to flying - I sign up for Ding, I compare between airlines, I watch for my flight price to drop and get a credit etc etc etc. But then, when it comes to upgrading my flight when I do online check-in, I will often fall for it. I find myself thinking "its only $50' or whatever, even though a $50 difference in my original flight price would have caused me heart palpitations!!! I know it seems crazy but I was wondering if anyone else has fallen into this behaviour??