OK - so I booked our flight from Birmingham to Orlando on Southwest with the great $49 fare but I only booked one way as the special ends October 1 and we leave October 2. I was starting to worry about our return flight as the lowest I could find was $96.
On a fluke today, I checked Delta for our return flight and it's $49 too!

It was over $100 before. This works out great as the flight is 3 hours later (6 pm) and I can check our luggage at the resort!
I'm not sure about other cities but just thought I would share the good news!