Sugarloaf closes that one chair on weekdays, looking at the mountain all the way to the right. West chair maybe? Not sure of the name. If you ski down it, you gotta hitchhike.

... I usually park and ski at Mellen but always take the shuttle to ski my fav trails at LP. The shuttle bus usually has other like minded folks. The only people who for sure would not do this would be those with a Mellen only season pass.
...

When I skied at Butternut last January during the mid-week, the Cruiser Chairlift was closed and as such you could not ski the upper parts of the Cruiser and Dipsy trails.

First Summary

MA
Vickery Bowl, Wachusett

NH
High Country, Waterville Valley
Dartmouth Skiway: One side or the other. (I know that used to be the case, but was told they regularly operate both sides now. Any confirmation?)

VT
A-Slope and Outpost, Pico
Wilderness, Bolton Valley
Practice Slope, Mad River Glen
Slidebrook, Sugarbush

I'll reject both the Cannon Mt. Tram and Sunbrook at Mt. Snow. Like the South Ridge at Killington, you can get to them albeit inconveniently.

Now I've never been to Mt. Snow when the Bear Trap was closed and Sunbrook was open. If this is the case, then Bear Trap becomes a pod for the list - although the Lift Line on Bear Trap, which is the inaccessible trail, is closed more than it is open.

More?