I just got wind yesterday, that once again the Port of Portland will be tearing up more ramp that they paved a few years ago. It looks like they will remove the asphalt North ramp next to Concourse E and replace it with concrete. This action will displace United Express and Jazz from July through October . This will also make United tow their RON's to the NE ramp next to the United cargo building.
The plan is to move UAX and Jazz to E4-E5. Then move part of the United operations down to D6-D8 for those months. So that will give United E1-E2-E3 and D6-D8.
The rumor was that Virgin America was going to use either D6 or D8 when they start PDX service. With this news now, I don't know where they will put Virgin America. Maybe D1 or D10?