Overheard while flying SFO-SJD-SFO today:
[Some Bizjet]: "...requesting clearance to HOU"
[MMSD GND] "SWA539 cleared to HOU..."
[Bizjet] "Confirm tail number for that cleaance?"
[MMSD] "SWA539?"
[Bizjet] "This is [Nxxxxx] looking for clearance HOU"

Expectation bias is real...even for ATC. #aviation

SWA539 (sqk:3336) is in the #PNW, GS:173kts, @2825ft, Cat:Large, 11 miles from #SeaTac(#KSEA), Hdg:S,, https://flightaware.com/live/flight/SWA539 #adsb #piaware

🇺🇸 N431WN - Boeing 737NG 7H4/W - Southwest Airlines SWA539/WN539, Nashville (BNA) to Indianapolis (IND) - 4.8 mi away @ 33500 ft, heading NW at 420 mph. Spotted 84x before. [10:50:27 PM CDT] #A528D6 #N431WN #B737 #SOUTHWEST #SWA539 #WN539 #ADSB #ADSBbot

🇺🇸 N219WN - Boeing 737NG 7H4/W - Southwest Airlines SWA539/WN539, Nashville (BNA) to Indianapolis (IND) - 5.2 mi away @ 39525 ft, heading NE at 590 mph. Spotted 82x before. [01:25:21 AM CDT] #A1DCF2 #N219WN #B737 #SOUTHWEST #SWA539 #WN539 #ADSB #ADSBbot