#N409AS
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aboveboston.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA358 #N409AS #B739 #PDX-#BOS
Time: 2026-09-21 15:42:19 EDT
Min Alt: 4800 ft
Min Dist: 0.86 nm (111deg ESE)
Squawk: #1552
#adsb <a href="/hashtag/planefence" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#planefence by kx1t - - - kx1t planefence sdr-e airplanes flightaware faa
September 21, 2026 at 8:21 PM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA497 #N409AS #B739
Time: 2026-08-12 18:28:45 CDT
Min Alt: 26300 ft
Min Dist: 147.8 nm (13deg NNE)

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August 12, 2026 at 11:35 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA473/AS473, St Louis Lambert (STL) to Seattle-Tacoma (SEA) - 3.6 mi away @ 11425 ft, heading WNW at 361 mph. Spotted 8x before. [06:21:31 AM CDT] #A4CE21 #N409AS #B739 #ALASKA #ASA473 #AS473 #Landing #Departure #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
July 25, 2026 at 11:21 AM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA405 #N409AS #B739 #SEA-#OKC-#SEA
Time: 2026-07-17 13:31:15 CDT
Min Alt: 17625 ft
Min Dist: 136.07 nm (-146deg SW)

#adsb #planefence by kx1t sdr-e adsbexchange flightaware faa
July 17, 2026 at 6:37 PM
kx1t-test.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA390 #N409AS #B739 #SAN-#BOS
Time: 2026-02-03 17:44:03 EST
Min Alt: 9350 ft
Min Dist: 0.98 nm (24deg NNE)

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February 3, 2026 at 10:51 PM
kx1t-test.bsky.social
#ICAO: #A4CE21
Owner: #ALASKA AIRLINES
Flt: #ASA1319 #N409AS #B739 #BOS-PDX
Time: 2025-11-28 20:26:47 EST
Min Alt: 8475 ft
Min Dist: 6.5 nm (72° ENE)
#dev #adsb #planefence by kx1t -•sdr-e•airplanes•flightaware•faa
November 29, 2025 at 1:38 AM
kx1t-test.bsky.social
#ICAO: #A4CE21
Owner: #ALASKA AIRLINES
Flt: #ASA358 #N409AS #B739 #SEA-BOS
Time: 2025-11-28 18:46:33 EST
Min Alt: 9575 ft
Min Dist: 1.1 nm (47° NE)
#dev #adsb #planefence by kx1t -•sdr-e•airplanes•flightaware•faa
November 28, 2025 at 11:58 PM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA1525 #N409AS #B739 #PDX-#MCI
Time: 2026-06-27 16:35:54 CDT
Min Alt: 23025 ft
Min Dist: 145.24 nm (20deg NNE)

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June 27, 2026 at 9:44 PM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA9414 #N409AS #B739 #SEA-#OKC
Time: 2026-06-22 18:25:55 CDT
Min Alt: 23675 ft
Min Dist: 145.81 nm (-153deg SSW)
Squawk: #3602
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June 22, 2026 at 11:34 PM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA9443 #N409AS #B739
Time: 2026-06-21 18:35:57 CDT
Min Alt: 24050 ft
Min Dist: 2.2 nm (-166deg SSW)
Squawk: #7047
#adsb #planefence by kx1t sdr-e adsbexchange flightaware faa
June 21, 2026 at 11:45 PM
ke0opr.bsky.social
ICAO: #A4CE21
Owner: #ALASKAAIRLINES
Flt: #ASA9577 #N409AS #B739 #SEA-#OKC
Time: 2026-05-19 13:19:20 CDT
Min Alt: 21850 ft
Min Dist: 131.56 nm (-140deg SW)
Squawk: #1507
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May 19, 2026 at 6:29 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA1538/AS1538, St Louis Lambert (STL) to Portland (PDX) - 4.4 mi away @ 13400 ft, heading NW at 417 mph. Spotted 7x before. [06:05:00 PM CDT] #A4CE21 #N409AS #B739 #ALASKA #ASA1538 #AS1538 #TakingOff #Departure #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
June 28, 2026 at 11:05 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA388/AS388 (SEA-STL-SEA) - 3.6 mi away @ 11800 ft, heading NW at 347 mph. Spotted 6x before. [05:50:30 PM CST] #A4CE21 #N409AS #B739 #ALASKA #ASA388 #AS388 #TakingOff #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
December 22, 2025 at 11:50 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA388/AS388 (SEA-STL-SEA) - 3.4 mi away @ 13150 ft, heading WNW at 379 mph. Spotted 5x before! [03:56:44 PM CDT] #A4CE21 #N409AS #B739 #ALASKA #ASA388 #AS388 #Landing #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
October 2, 2025 at 8:56 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA388/AS388 (SEA-STL-SEA) - 3.2 mi away @ 11700 ft, heading NW at 427 mph. Spotted 4x before! [03:53:44 PM CDT] #A4CE21 #N409AS #B739 #ALASKA #ASA388 #AS388 #Landing #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
September 29, 2025 at 8:53 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA473/AS473, St Louis Lambert (STL) to Seattle-Tacoma (SEA) - 3.5 mi away @ 13625 ft, heading NW at 418 mph. Spotted 3x before! [07:04:12 AM CDT] #A4CE21 #N409AS #B739 #ALASKA #ASA473 #AS473 #TakingOff #Departure #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
August 4, 2025 at 12:04 PM
abovestlouis.com
🇺🇸 N409AS - Boeing 737NG 990ER/W - Alaska Airlines ASA9675/AS9675, General Mitchell (MKE) to Licenciado Gustavo Diaz Ordaz (PVR) - 3.8 mi away @ 33750 ft, heading WSW at 410 mph. Spotted 2x before! [09:25:26 AM CST] #A4CE21 #N409AS #B739 #ALASKA #ASA9675 #AS9675 #ADSB #ADSBbot
Map of the St. Louis area showing the position and track of the aircraft described in the post.
January 25, 2025 at 3:25 PM