Southwest Airlines Flight Status
About Southwest Airlines
Southwest Airlines, based in United States, operates under the ICAO code SWA and the IATA code WN; its radio callsign is "Southwest". On this page you can follow Southwest Airlines flights and find the airports it serves.
How to read a Southwest Airlines flight number
Every Southwest Airlines flight number starts with WN, followed by up to four digits: that is the number on your booking confirmation and boarding pass. In flight plans the same flight carries the ICAO prefix SWA, and controllers address it as "Southwest". One thing to watch: codeshares. A ticket sold by another airline can be operated by Southwest Airlines and vice versa; live tracking follows the operating carrier's number, so if your search comes up empty, check the "operated by" line on your booking.
Southwest Airlines flights we tracked
Over the first 68 days of our own live tracking we logged 16461 aircraft movements operated by Southwest Airlines. These figures are refreshed weekly. Tracking data: adsb.lol · Route data: adsbdb.com.
Routes we tracked on Southwest Airlines
| # | Route | Tracked flights |
|---|---|---|
| 1 | San Diego (SAN) → Oakland (OAK) | 227 |
| 2 | San Diego (SAN) → San Jose (SJC) | 224 |
| 3 | San Jose (SJC) → San Diego (SAN) | 207 |
| 4 | Burbank (BUR) → Oakland (OAK) | 199 |
| 5 | Las Vegas (LAS) → Oakland (OAK) | 196 |
| 6 | Santa Ana (SNA) → Oakland (OAK) | 171 |
| 7 | Burbank (BUR) → San Jose (SJC) | 170 |
| 8 | San Jose (SJC) → Las Vegas (LAS) | 166 |
| 9 | Oakland (OAK) → Burbank (BUR) | 139 |
| 10 | San Jose (SJC) → Burbank (BUR) | 134 |
| 11 | Oakland (OAK) → Las Vegas (LAS) | 131 |
| 12 | Los Angeles (LAX) → Oakland (OAK) | 129 |
| 13 | Baltimore (BWI) → Boston (BOS) | 128 |
| 14 | San Jose (SJC) → Santa Ana (SNA) | 115 |
| 15 | San Jose (SJC) → Los Angeles (LAX) | 109 |
| 16 | Long Beach (LGB) → Oakland (OAK) | 101 |
| 17 | San Jose (SJC) → Portland (PDX) | 101 |
| 18 | Las Vegas (LAS) → San Jose (SJC) | 98 |
| 19 | Seattle (SEA) → Oakland (OAK) | 96 |
| 20 | Santa Ana (SNA) → San Jose (SJC) | 93 |
| 21 | Baltimore (BWI) → Manchester (MHT) | 88 |
| 22 | Burbank (BUR) → San Francisco (SFO) | 85 |
| 23 | Los Angeles (LAX) → San Jose (SJC) | 82 |
| 24 | Boston (BOS) → Baltimore (BWI) | 81 |
| 25 | Baltimore (BWI) → Albany (ALB) | 80 |
| 26 | Phoenix (PHX) → Oakland (OAK) | 80 |
| 27 | Ontario (ONT) → Oakland (OAK) | 78 |
| 28 | San Jose (SJC) → Denver (DEN) | 76 |
| 29 | San Jose (SJC) → Seattle (SEA) | 74 |
| 30 | Denver (DEN) → Oakland (OAK) | 72 |
| 31 | Chicago (MDW) → Boston (BOS) | 69 |
| 32 | Las Vegas (LAS) → San Francisco (SFO) | 67 |
| 33 | Baltimore (BWI) → Portland (PWM) | 66 |
| 34 | San Diego (SAN) → San Francisco (SFO) | 66 |
| 35 | Dallas (DAL) → New York (LGA) | 65 |
| 36 | Nashville (BNA) → New York (LGA) | 65 |
| 37 | Phoenix (PHX) → San Francisco (SFO) | 64 |
| 38 | Oakland (OAK) → Los Angeles (LAX) | 62 |
| 39 | Philadelphia (PHL) → Chicago (MDW) | 61 |
| 40 | Los Angeles (LAX) → San Francisco (SFO) | 61 |
| 41 | Orlando (MCO) → New Orleans (MSY) | 60 |
| 42 | Chicago (MDW) → Philadelphia (PHL) | 60 |
| 43 | Baltimore (BWI) → Hartford (BDL) | 59 |
| 44 | Phoenix (PHX) → San Jose (SJC) | 59 |
| 45 | Ontario (ONT) → San Jose (SJC) | 59 |
| 46 | Denver (DEN) → San Francisco (SFO) | 59 |
| 47 | Portland (PDX) → Oakland (OAK) | 58 |
| 48 | San Francisco (SFO) → Las Vegas (LAS) | 58 |
| 49 | Providence (PVD) → Baltimore (BWI) | 57 |
| 50 | Albany (ALB) → Baltimore (BWI) | 57 |
| 51 | San Jose (SJC) → Phoenix (PHX) | 56 |
| 52 | Oakland (OAK) → Phoenix (PHX) | 56 |
| 53 | Boston (BOS) → St Louis (STL) | 56 |
| 54 | Seattle (SEA) → San Jose (SJC) | 55 |
| 55 | Boise (BOI) → Oakland (OAK) | 55 |
| 56 | Palm Springs (PSP) → Oakland (OAK) | 54 |
| 57 | Portland (PDX) → San Jose (SJC) | 54 |
| 58 | Atlanta (ATL) → New York (LGA) | 52 |
| 59 | Denver (DEN) → Austin (AUS) | 52 |
| 60 | Chicago (MDW) → Orlando (MCO) | 51 |
| 61 | San Jose (SJC) → Boise (BOI) | 51 |
| 62 | St Louis (STL) → New York (LGA) | 50 |
| 63 | Houston (HOU) → New York (LGA) | 50 |
| 64 | Denver (DEN) → San Jose (SJC) | 49 |
| 65 | Oakland (OAK) → Ontario (ONT) | 49 |
| 66 | Oakland (OAK) → Portland (PDX) | 49 |
| 67 | Portland (PWM) → Baltimore (BWI) | 48 |
| 68 | St Louis (STL) → Boston (BOS) | 47 |
| 69 | Chicago (MDW) → New Orleans (MSY) | 47 |
| 70 | San Francisco (SFO) → Burbank (BUR) | 46 |
| 71 | Islip (ISP) → Baltimore (BWI) | 46 |
| 72 | Baltimore (BWI) → Providence (PVD) | 44 |
| 73 | San Jose (SJC) → Austin (AUS) | 44 |
| 74 | Oakland (OAK) → Santa Ana (SNA) | 44 |
| 75 | Manchester (MHT) → Baltimore (BWI) | 43 |
| 76 | Nashville (BNA) → Boston (BOS) | 43 |
| 77 | Denver (DEN) → Boston (BOS) | 42 |
| 78 | Denver (DEN) → New York (LGA) | 42 |
| 79 | Hartford (BDL) → Baltimore (BWI) | 42 |
| 80 | Salt Lake City (SLC) → Denver (DEN) | 42 |
| 81 | San Francisco (SFO) → San Diego (SAN) | 41 |
| 82 | Phoenix (PHX) → Austin (AUS) | 40 |
| 83 | Orlando (MCO) → Chicago (MDW) | 39 |
| 84 | Ontario (ONT) → Las Vegas (LAS) | 39 |
| 85 | San Francisco (SFO) → Phoenix (PHX) | 38 |
| 86 | Phoenix (PHX) → Denver (DEN) | 38 |
| 87 | Las Vegas (LAS) → Austin (AUS) | 38 |
| 88 | Nashville (BNA) → Chicago (MDW) | 37 |
| 89 | New York (LGA) → Chicago (MDW) | 37 |
| 90 | Baltimore (BWI) → Buffalo (BUF) | 36 |
| 91 | Baltimore (BWI) → Tampa (TPA) | 36 |
| 92 | Oakland (OAK) → Palm Springs (PSP) | 36 |
| 93 | Nashville (BNA) → Dallas (DAL) | 36 |
| 94 | Las Vegas (LAS) → Burbank (BUR) | 36 |
| 95 | Boston (BOS) → Chicago (MDW) | 35 |
| 96 | Cincinnati / Covington (CVG) → Chicago (MDW) | 35 |
| 97 | San Diego (SAN) → Las Vegas (LAS) | 35 |
| 98 | Dallas (DAL) → Chicago (MDW) | 35 |
| 99 | San Jose (SJC) → Ontario (ONT) | 34 |
| 100 | San Jose (SJC) → Long Beach (LGB) | 34 |
| 101 | New York (LGA) → Atlanta (ATL) | 34 |
| 102 | Boston (BOS) → Denver (DEN) | 34 |
| 103 | Austin (AUS) → San Jose (SJC) | 33 |
| 104 | Washington (DCA) → Providence (PVD) | 33 |
| 105 | Chicago (MDW) → Minneapolis (MSP) | 33 |
| 106 | San Diego (SAN) → Austin (AUS) | 33 |
| 107 | Nashville (BNA) → Philadelphia (PHL) | 33 |
| 108 | Phoenix (PHX) → Dallas (DAL) | 33 |
| 109 | Santa Ana (SNA) → Denver (DEN) | 32 |
| 110 | Manchester (MHT) → Chicago (MDW) | 32 |
| 111 | Las Vegas (LAS) → Denver (DEN) | 32 |
| 112 | Columbus (CMH) → Chicago (MDW) | 32 |
| 113 | Denver (DEN) → Chicago (ORD) | 31 |
| 114 | Las Vegas (LAS) → Bellingham (BLI) | 31 |
| 115 | Denver (DEN) → Las Vegas (LAS) | 31 |
| 116 | Nashville (BNA) → Tampa (TPA) | 31 |
| 117 | Oakland (OAK) → Seattle (SEA) | 31 |
| 118 | St Louis (STL) → Chicago (MDW) | 31 |
| 119 | Chicago (MDW) → Albany (ALB) | 31 |
| 120 | Atlanta (ATL) → Denver (DEN) | 30 |
| 121 | Reno (RNO) → Las Vegas (LAS) | 30 |
| 122 | Oakland (OAK) → San Diego (SAN) | 30 |
| 123 | Baltimore (BWI) → Cincinnati / Covington (CVG) | 30 |
| 124 | Orlando (MCO) → Baltimore (BWI) | 29 |
| 125 | Oakland (OAK) → Reno (RNO) | 29 |
| 126 | Chicago (MDW) → St Louis (STL) | 29 |
| 127 | San Jose (SJC) → Honolulu (HNL) | 29 |
| 128 | Atlanta (ATL) → New Orleans (MSY) | 29 |
| 129 | Orlando (MCO) → Milwaukee (MKE) | 28 |
| 130 | New Orleans (MSY) → Dallas (DAL) | 28 |
| 131 | Sacramento (SMF) → Las Vegas (LAS) | 28 |
| 132 | Chicago (MDW) → Omaha (OMA) | 28 |
| 133 | Denver (DEN) → Orlando (MCO) | 28 |
| 134 | New York (LGA) → Houston (HOU) | 27 |
| 135 | San Francisco (SFO) → Los Angeles (LAX) | 27 |
| 136 | Las Vegas (LAS) → Phoenix (PHX) | 27 |
| 137 | Burbank (BUR) → Phoenix (PHX) | 27 |
| 138 | Orlando (MCO) → Manchester (MHT) | 27 |
| 139 | Hartford (BDL) → Chicago (MDW) | 27 |
| 140 | Baltimore (BWI) → New Orleans (MSY) | 27 |
| 141 | Oakland (OAK) → Denver (DEN) | 26 |
| 142 | Baltimore (BWI) → Syracuse (SYR) | 26 |
| 143 | Denver (DEN) → Nashville (BNA) | 26 |
| 144 | St Louis (STL) → Dallas (DAL) | 26 |
| 145 | Philadelphia (PHL) → St Louis (STL) | 26 |
| 146 | Los Angeles (LAX) → Las Vegas (LAS) | 26 |
| 147 | Chicago (MDW) → Hartford (BDL) | 26 |
| 148 | Chicago (MDW) → Oakland (OAK) | 26 |
| 149 | Omaha (OMA) → Chicago (MDW) | 26 |
| 150 | Chicago (MDW) → Washington (DCA) | 26 |
| 151 | St Louis (STL) → Philadelphia (PHL) | 26 |
| 152 | Chicago (MDW) → Louisville (SDF) | 25 |
| 153 | Dallas (DAL) → Houston (HOU) | 25 |
| 154 | Long Beach (LGB) → San Jose (SJC) | 25 |
| 155 | San Jose (SJC) → Kahului (OGG) | 25 |
| 156 | Austin (AUS) → Orlando (MCO) | 25 |
| 157 | Austin (AUS) → New Orleans (MSY) | 25 |
| 158 | Austin (AUS) → Chicago (MDW) | 25 |
| 159 | Philadelphia (PHL) → Nashville (BNA) | 25 |
| 160 | Albany (ALB) → Orlando (MCO) | 25 |
| 161 | Oakland (OAK) → Houston (HOU) | 25 |
| 162 | Islip (ISP) → Nashville (BNA) | 25 |
| 163 | Austin (AUS) → Oakland (OAK) | 25 |
| 164 | Chicago (MDW) → Providence (PVD) | 25 |
| 165 | Buffalo (BUF) → Fort Myers (RSW) | 25 |
| 166 | San Jose (SJC) → Dallas (DAL) | 24 |
| 167 | Washington (DCA) → Dallas (DAL) | 24 |
| 168 | Orlando (MCO) → Columbus (CMH) | 24 |
| 169 | Chicago (MDW) → Cincinnati / Covington (CVG) | 24 |
| 170 | Baltimore (BWI) → Fort Lauderdale (FLL) | 24 |
| 171 | Albany (ALB) → Chicago (MDW) | 23 |
| 172 | Burbank (BUR) → Las Vegas (LAS) | 23 |
| 173 | St Louis (STL) → Atlanta (ATL) | 23 |
| 174 | Kansas City (MCI) → Denver (DEN) | 23 |
| 175 | Cleveland (CLE) → Baltimore (BWI) | 23 |
| 176 | Boston (BOS) → Nashville (BNA) | 23 |
| 177 | New York (LGA) → Dallas (DAL) | 23 |
| 178 | Houston (HOU) → Oakland (OAK) | 23 |
| 179 | Chicago (MDW) → Baltimore (BWI) | 23 |
| 180 | Manchester (MHT) → Orlando (MCO) | 23 |
| 181 | Dallas (DAL) → New Orleans (MSY) | 23 |
| 182 | Tampa (TPA) → Providence (PVD) | 22 |
| 183 | Baltimore (BWI) → Kansas City (MCI) | 22 |
| 184 | St Louis (STL) → Tampa (TPA) | 22 |
| 185 | Baltimore (BWI) → Orlando (MCO) | 22 |
| 186 | Denver (DEN) → Des Moines (DSM) | 22 |
| 187 | New Orleans (MSY) → Denver (DEN) | 22 |
| 188 | Providence (PVD) → Chicago (MDW) | 22 |
| 189 | San Jose (SJC) → Salt Lake City (SLC) | 22 |
| 190 | Baltimore (BWI) → Denver (DEN) | 22 |
| 191 | Chicago (MDW) → Pittsburgh (PIT) | 22 |
| 192 | Denver (DEN) → Houston (IAH) | 22 |
| 193 | Baltimore (BWI) → Jacksonville (JAX) | 22 |
| 194 | Baltimore (BWI) → Milwaukee (MKE) | 22 |
| 195 | Phoenix (PHX) → Chicago (MDW) | 22 |
| 196 | Washington (DCA) → Chicago (MDW) | 22 |
| 197 | Baltimore (BWI) → Indianapolis (IND) | 21 |
| 198 | San Diego (SAN) → Sacramento (SMF) | 21 |
| 199 | Indianapolis (IND) → Fort Myers (RSW) | 21 |
| 200 | Tampa (TPA) → New Orleans (MSY) | 21 |
| 201 | Kahului (OGG) → San Jose (SJC) | 21 |
| 202 | Chicago (MDW) → Cleveland (CLE) | 21 |
| 203 | Baltimore (BWI) → Las Vegas (LAS) | 21 |
| 204 | Baltimore (BWI) → Dallas (DAL) | 21 |
| 205 | Las Vegas (LAS) → Sacramento (SMF) | 21 |
| 206 | Sacramento (SMF) → Nashville (BNA) | 21 |
| 207 | Las Vegas (LAS) → San Diego (SAN) | 20 |
| 208 | Portland (PDX) → Denver (DEN) | 20 |
| 209 | Houston (HOU) → Dallas (DAL) | 20 |
| 210 | Dallas (DAL) → Washington (DCA) | 20 |
| 211 | Atlanta (ATL) → Philadelphia (PHL) | 20 |
| 212 | New York (LGA) → St Louis (STL) | 20 |
| 213 | Chicago (MDW) → Denver (DEN) | 20 |
| 214 | Spokane (GEG) → San Jose (SJC) | 20 |
| 215 | Kahului (OGG) → Oakland (OAK) | 20 |
| 216 | Phoenix (PHX) → Chicago (ORD) | 20 |
| 217 | Sacramento (SMF) → Burbank (BUR) | 20 |
| 218 | Providence (PVD) → Orlando (MCO) | 20 |
| 219 | Albuquerque (ABQ) → Oakland (OAK) | 19 |
| 220 | Baltimore (BWI) → Charleston (CHS) | 19 |
| 221 | Kansas City (MCI) → New York (LGA) | 19 |
| 222 | Santa Ana (SNA) → Phoenix (PHX) | 19 |
| 223 | Cincinnati / Covington (CVG) → Baltimore (BWI) | 19 |
| 224 | San Jose (SJC) → Spokane (GEG) | 19 |
| 225 | Denver (DEN) → Portland (PDX) | 19 |
| 226 | New York (LGA) → Nashville (BNA) | 19 |
| 227 | Spokane (GEG) → Oakland (OAK) | 19 |
| 228 | New Orleans (MSY) → Chicago (MDW) | 19 |
| 229 | Tampa (TPA) → Chicago (ORD) | 19 |
| 230 | Kansas City (MCI) → Dallas (DAL) | 19 |
| 231 | Las Vegas (LAS) → Baltimore (BWI) | 19 |
| 232 | Chicago (MDW) → New York (LGA) | 19 |
| 233 | Chicago (MDW) → Columbus (CMH) | 19 |
| 234 | Baltimore (BWI) → New York (LGA) | 18 |
| 235 | New Orleans (MSY) → Houston (HOU) | 18 |
| 236 | Fort Lauderdale (FLL) → Chicago (MDW) | 18 |
| 237 | Reno (RNO) → Oakland (OAK) | 18 |
| 238 | Atlanta (ATL) → Chicago (MDW) | 18 |
| 239 | Phoenix (PHX) → Santa Ana (SNA) | 18 |
| 240 | New Orleans (MSY) → Orlando (MCO) | 18 |
| 241 | Tampa (TPA) → Columbus (CMH) | 18 |
| 242 | Nashville (BNA) → Detroit (DTW) | 18 |
| 243 | San Diego (SAN) → Phoenix (PHX) | 18 |
| 244 | Atlanta (ATL) → Baltimore (BWI) | 18 |
| 245 | Las Vegas (LAS) → Kansas City (MCI) | 18 |
| 246 | Salt Lake City (SLC) → Oakland (OAK) | 18 |
| 247 | Phoenix (PHX) → Oklahoma City (OKC) | 18 |
| 248 | Chicago (MDW) → Atlanta (ATL) | 18 |
| 249 | Orlando (MCO) → Providence (PVD) | 17 |
| 250 | El Paso (ELP) → Austin (AUS) | 17 |
| 251 | Oklahoma City (OKC) → Washington (DCA) | 17 |
| 252 | San Diego (SAN) → Baltimore (BWI) | 17 |
| 253 | St Louis (STL) → Denver (DEN) | 17 |
| 254 | Milwaukee (MKE) → Orlando (MCO) | 17 |
| 255 | Denver (DEN) → Washington (IAD) | 17 |
| 256 | Baltimore (BWI) → Austin (AUS) | 17 |
| 257 | Chicago (MDW) → Las Vegas (LAS) | 17 |
| 258 | Chicago (MDW) → Tampa (TPA) | 16 |
| 259 | Oakland (OAK) → Long Beach (LGB) | 16 |
| 260 | St Louis (STL) → Jacksonville (JAX) | 16 |
| 261 | Memphis (MEM) → Dallas (DAL) | 16 |
| 262 | St Louis (STL) → Phoenix (PHX) | 16 |
| 263 | Oakland (OAK) → Salt Lake City (SLC) | 16 |
| 264 | Baltimore (BWI) → Atlanta (ATL) | 16 |
| 265 | Denver (DEN) → Sacramento (SMF) | 16 |
| 266 | Fort Myers (RSW) → St Louis (STL) | 16 |
| 267 | Orlando (MCO) → Chicago (ORD) | 16 |
| 268 | Dallas (DAL) → San Jose (SJC) | 16 |
| 269 | Orlando (MCO) → Atlanta (ATL) | 16 |
| 270 | Tampa (TPA) → Indianapolis (IND) | 16 |
| 271 | Kansas City (MCI) → Oakland (OAK) | 15 |
| 272 | Chicago (MDW) → Kansas City (MCI) | 15 |
| 273 | New Orleans (MSY) → Los Angeles (LAX) | 15 |
| 274 | Austin (AUS) → Ontario (ONT) | 15 |
| 275 | Oakland (OAK) → Bellingham (BLI) | 15 |
| 276 | Orlando (MCO) → Albany (ALB) | 15 |
| 277 | Denver (DEN) → Phoenix (PHX) | 15 |
| 278 | Phoenix (PHX) → Baltimore (BWI) | 15 |
| 279 | Washington (DCA) → New Orleans (MSY) | 15 |
| 280 | Las Vegas (LAS) → Boise (BOI) | 15 |
| 281 | Philadelphia (PHL) → Denver (DEN) | 15 |
| 282 | Austin (AUS) → San Diego (SAN) | 15 |
| 283 | Jacksonville (JAX) → Baltimore (BWI) | 15 |
| 284 | Houston (HOU) → Denver (DEN) | 15 |
| 285 | Chicago (MDW) → Dallas (DAL) | 15 |
| 286 | Dallas (DAL) → Las Vegas (LAS) | 15 |
| 287 | Hartford (BDL) → Orlando (MCO) | 15 |
| 288 | New Orleans (MSY) → Tampa (TPA) | 15 |
| 289 | Las Vegas (LAS) → Los Angeles (LAX) | 15 |
| 290 | Milwaukee (MKE) → Phoenix (PHX) | 15 |
| 291 | Chicago (MDW) → Houston (HOU) | 15 |
| 292 | Denver (DEN) → Long Beach (LGB) | 14 |
| 293 | New Orleans (MSY) → New York (LGA) | 14 |
| 294 | Eugene (EUG) → Oakland (OAK) | 14 |
| 295 | Nashville (BNA) → Fort Lauderdale (FLL) | 14 |
| 296 | Tampa (TPA) → Baltimore (BWI) | 14 |
| 297 | Burbank (BUR) → Denver (DEN) | 14 |
| 298 | Oakland (OAK) → Dallas (DAL) | 14 |
| 299 | Minneapolis (MSP) → Chicago (MDW) | 14 |
| 300 | Atlanta (ATL) → St Louis (STL) | 14 |
Top 10 Southwest Airlines flights we tracked
| # | Flight | Route | Times seen |
|---|---|---|---|
| 1 | SWA4303 | Sacramento (SMF) → Nashville (BNA) | 21 |
| 2 | SWA1771 | Seattle (SEA) → San Jose (SJC) | 20 |
| 3 | SWA2222 | Las Vegas (LAS) → Oakland (OAK) | 19 |
| 4 | SWA300 | Hartford (BDL) → Chicago (MDW) | 19 |
| 5 | SWA107 | San Jose (SJC) → San Diego (SAN) | 18 |
| 6 | SWA1604 | Palm Springs (PSP) → Oakland (OAK) | 17 |
| 7 | SWA1683 | Ontario (ONT) → Las Vegas (LAS) | 16 |
| 8 | SWA2192 | St Louis (STL) → Denver (DEN) | 16 |
| 9 | SWA3620 | Baltimore (BWI) → Boston (BOS) | 16 |
| 10 | SWA375 | Denver (DEN) → Oakland (OAK) | 16 |
Frequently asked questions about Southwest Airlines
Where is my Southwest Airlines flight right now?
Search the flight number (WN plus digits) in the search box on this page. If the aircraft is airborne within receiver coverage, you will see its live status; before departure you will see the route.
Is my Southwest Airlines flight delayed or cancelled?
Check the flight number on this page for live status, but for rebooking, gate changes and cancellations the airline itself remains the authoritative source.
What do WN and SWA mean on Southwest Airlines flights?
They are two prefixes for the same airline. WN is the IATA code you see on tickets; SWA is the ICAO code used in flight plans and by air traffic control.
Does Southwest Airlines operate flights for other airlines?
Codeshare agreements mean a flight sold under another carrier's number may be operated by Southwest Airlines, and the reverse. Live tracking always follows the operating carrier's flight number; check the "operated by" line on your booking.