WS summer changes:
DEN - 4x Weekly (Overall decrease from S18) Op days: 2457
IAH - Increased to 13x Weekly (I don't remember if they had Sat flights last year)
YQB - 4x Weekly, now timed for transborder connections
YYZ - 789 Service extended into summer months (WS 658/651)
BNA - 3x Weekly (Overall decrease from S18, 5x weekly)
WS80/81 no longer shows as a thru flight, only YHZ-CDG-YHZ.
There's probably more, but I'll check again later.
Edit: According to this:
https://www.airliners.net/forum/viewtopic.php?f=3&t=1414093 Also adding AUS & PDX?