C425Driver,
I used to be with Ryan, but am now at AirTran, so I can't really comment on Ryan's future plans. As far as the AirTran contract goes, there is the possibility of one or two more aircraft, but the closer we get to the delivery dates of our 737s (June 2004, or earlier), then the less likely that would be.
I can say that historically, the number of aircraft that Ryan operates fluctates wildly, depending upon many factors. Traditionally, these numbers go up for the winter season, due to the fact that the aircraft they operate belong to European charter airlines and winter is their off season, but then that number goes down by this same amount in the summer, as these operators take their aircraft back.