There is a an apron replacement project underway on the south side of the C-1 pier, so WB-capable gates C71, 74 and maybe 75 are currently out of service. UA would prefer to send Polaris flights out of C but in the absence of 3 777-capable gates and most of the summer seasonal flying still operating, there is a bit of a squeeze.

DUB can arrive at any WB gate in A or C because it's precleared before departure.