I noticed this today. My bar graph shows $2K-$3K. When I check my online Amex statement, it shows $2762 in charges since my last statement, or, beginning on Dec 30, so they must have their systems linked together for real-time info. By the same token, Amex access online always has your up-to-date SkyMiles balance (which has always spooked me a little) - and to have Delta knowing your up-to-the-minute spend seems even more weird.