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.
Written on 2016年 08月 23日
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.