ETD .30L = Estimated Time of Departure is 30 minutes late

LTEQ/1245CT/1345-2000/PROB DLYS/DVRT/CNCL-THUNDERSTORMS = Not sure on this one, perhaps late arriving equipment due to delayed/diverted/cancelled flights due to thunderstorms

+ETA .43L = Estiamted Time of Arrival is 43 minutes late

LTEQ+ = Again not sure other than late arriving equipment

united.com says schedule change due to late arriving aircraft.