The reason is route was upgraded to an A388 was that UA lost there GSA city pair contract (this is the how the US Government buys airfare for employees) for the route to B6. Of course B6 is code sharing with EK on this route. That contract is for about 40 J pax a day as most government employees can book into J in this long of a segment. UA has since cut the route. No clue what Y demand is for this route.