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

🇺🇸 N711ZX - Boeing 757 231/W - Delta Air Lines DAL1728/DL1728, General Edward Lawrence Logan (BOS) to Los Angeles (LAX) - 4.5 mi away @ 39800 ft, heading WSW at 471 mph. Spotted for first time! [03:32:00 PM CST] #A98219 #N711ZX #B752 #DELTA #DAL1728 #DL1728 #ADSB #ADSBbot

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

🇺🇸 N705TW - Boeing 757 231/W - Delta Air Lines DAL1728/DL1728, General Edward Lawrence Logan (BOS) to Los Angeles (LAX) - 4.4 mi away @ 36075 ft, heading WSW at 550 mph. Spotted 5x before! [12:21:45 PM CDT] #A968DF #N705TW #B752 #DELTA #DAL1728 #DL1728 #ADSB #ADSBbot