Did some further inspection of the PS transcons and noticed something weird. UA seems to have loaded a "real" schedule with an array of widebodies plus the occasional 752 until 6/24, and again starting 8/1, resembling what they've operated throughout the pandemic. Between 6/24 and 8/1, however, they still have the placeholder schedule loaded, with the occasional 781 or 772HD and an army of almost-hourly 752s at other times (LAX-EWR has them at quarter past the hour, SFO-EWR at half past).
Have they really decided what they'll preliminarily be flying in August but not in July?