Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N309DU - Airbus A220 300 - Delta Air Lines DAL2251/DL2251, General Edward Lawrence Logan (BOS) to Dallas-Fort Worth (DFW) - 4.5 mi away @ 38100 ft, heading WSW at 500 mph. Spotted 26x before! [07:36:16 PM CDT] #A3411F #N309DU #BCS3 #DELTA #DAL2251 #DL2251 #ADSB #ADSBbot

Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N333DU - AIRBUS A220-300 - DELTA AIR LINES INC DAL2251/DL2251, General Edward Lawrence Logan (BOS) to Dallas-Fort Worth (DFW) - 4.6 mi away @ 37800 ft, heading WSW at 527 mph. Spotted for first time! [06:07:01 PM CDT] #A3A152 #N333DU #BCS3 #DAL2251 #DL2251 #ADSB #ADSBbot