Originally Posted by
FlyHighInTheSky
Isn't it even the shortest route United flies (both mainline and regional jets)?
GUM-ROP (Guam - Rota) is shorter at 56 miles (compared to 67 for ORD-MKE) according to Great Circle mapper.
*But I believe GUM-ROP is operated on a turboprop, so you may escape on a technicality.