Hi, I've had very mixed results with Delta. If you leave your starting point on time, Delta would be fine (I've gone thru Atlanta myself and I'm actually impressed in how efficient that airport is for being so large). But if you're late getting to Atlanta and miss your connection, Delta has no heart at all and didn't put much effort in helping me find a stand by flight down (I had to go thru stand by 3 times at 3 different gates the day I missed my connection and every time, the people at the desk wouldn't tell me if I would make the flight until they finally let me on the 3rd flight. The 1st and 2nd time, I found out by them closing the door to the airplane and walking away. Thus, also forcing me to use my internet connection on my smart phone to find the next available flight for standby). That was Nov of 2016 and I haven't flown Delta since. But I do understand trying to find a good flight deal in today's ever increasing flight costs (and I could be lured back to Delta if I found a big enough deal). So make sure you come prepared (charged smart phone with maybe expedia app or web link to atlanta airport already installed on your device, or even a list of other Delta flights going to MoBay later that day) just in case you have problems with your connection.