I use this site for my logbook when I forget the the last two digits of a tail number. It seems to be updated regularly and it shows we currently have 655 aircraft with 22 on order. Maybe that increase to 49 on order/conversion will put us back closer to the "baseline" 690 aircraft. Not, sure what to make of it.
Southwest Airlines Fleet Details and History - Planespotters.net Just Aviation
Also, am I the only one that is looking forward to the lightweight jacket option in the works?