Boeing 737-700 (N721RW)

Beautiful shot Rudy-another SWA travel poster created. 5*

This is actually a 737-300. If you look on the roof, there is no WiFi hump.

fishingpilot737 It's a -700, just not a particularly recent photo. The -300 flap canoes aren't painted and they're more pointy. The submitter's got the wrong tail number, as N721RW was a Republic 727. Southwest fleet no. 721 was a -200.

300s end in SW. 700s are WN and 800s are a single letter. There are a couple that don't conform to this however

The way the number system worked before SWA started buying used for 700s was SW originally, then WN. If SW was not available at the beginning, then they used SA; then it was if WN was not available, then they'd use SW, and if neither was available then they'd use LV (for LUV). For example N793SA has that tail number because N793SW was already taken. Similarly, N555LV has that tail number because N555WN and N555SW were taken.