Originally Posted by
trm2
Don’t forget that the seat belts are anchored on either side of the seat about 17 inches apart. So if the 31 inches is right (I don’t know) that would be 48 inches. I’ll just say that my waist is larger than your partners and I could gain another 10 to 12 inches in my waist and still fit comfortably.
This.
Not sure the link from OP is particularly useful, as it doesn't really tell the whole story; the graph doesn't take into account where the seat belts are anchored, for instance.
Also, there's different seats on the same planes; I presume they are talking about E?
And 31" seat-belt length doesn't equate to 31" waist, otherwise UA would lose ~80% of its passengers!
This from OP - not very telling, IMO:
