🇺🇸 N37506 - Boeing 737MAX 9 - United Airlines UAL2139/UA2139, Chicago O'Hare (ORD) to George Bush Intcntl/Houston (IAH) - 5.1 mi away @ 35950 ft, heading SW at 511 mph. Spotted 5x before. [07:39:44 PM CDT] #A448D5 #N37506 #B39M #UNITED #UAL2139 #UA2139 #ADSB #ADSBbot