We're looking at doing a trip to DUB in Jan or Feb. One of the routings had a 1:20 layover at ORD. While this must be within MCT, I definitely didn't feel comfortable with this considering weather and immigration implications and will go for the ~3 hour layover instead.
Cheers.
That would be wise... i endended up sluming it in united slc a few weeks ago when border patrol were on a go slow and customs didn't like my (honest) answer that I was going shopping!