FYI
NTSB has asked (1700 EST) that RT 46 be closed for a 'few days' so they can do their investigation and remove the A/C from the building.
The BEST (read: "soon to be crowded") alternate will be I-80
I've driven 46 often---its a miracle that it wasn't wall-to-wall cars at that spot like it usually is.
From NJ to Montana that's some difference. How is the big sky country with very little cars and speed limits?