As United Airlines works to repaint all of its aircraft with the Continental globe livery, there are still a number of variations out there. United never got around to updating its gray livery on many aircraft when it introduced a white design about five years ago and United also introduced a heritage aircraft last year with a livery from the 1970s.
I have to think this was not deliberate, but last week in Denver the four liveries all happened to be on the ground at the same time, parked next to each other. A controller in the ramp tower snapped this photo:
The new livery is still my least favorite, but I am sure it will grow on me over time, just like the gray did.
(tip of the hat to Steve)