MWAA CEO Jack Potter made a 35-minute appearance at the Oct. 17 meeting of the Fairfax County Board of Supervisors Transportation Committee, and it was surprisingly info-dense about upcoming IAD developments:

• The Tier 2-East concourse (seen in the renderings below from the capital-projects presentation at the Oct. 18 MWAA board meeting) should soon be something you'll be able to see under construction as your plane taxis past its site above the current "C" Aerotrain stop--“We’re hoping to break ground in, hopefully, the next month,” Potter said--with entry into service in 2026. This $580 million project will have gate space for seven widebodies, 14 narrowbodies, or some mix, and Potter said during Q&A that United plans to move some of its evening bank of international departures to those gates.
• The longer-term plan for IAD, shown in the second slide from the capital-projects presentation, envisages complete replacement of C/D moving west from the Tier 2-East project--plus replacement of the low-A gates with a larger concourse, a connector structure between A/B and the Main Terminal, and an E concourse aligned with the midfield control tower.
• That connector will include an FIS, which Potter said will lead to the closure of the existing IAB: “We’re going to move the international arrivals into that facility, so people will be connected—no longer will you have to take a mobile lounge there.”
• Potter said that "“all of our international flights” will move to the expanded A/B concourse, which doesn't make sense given how many international United flights already operate at IAD. And how past renderings of Tier 2-East have shown a glassed-in upper level like what's at EWR C that leads arriving pax to that terminal's FIS.
• There's already a roughed-in Aerotrain stop below the future site of the E concourse that Potter said only needs escalators, elevators “and some finishes.”
• During Q&A, Potter answered the who-pays-for-this question: “We’re very close to signing an agreement with the airlines, on top of that $580 million, another $6 billion investment in Dulles Airport over the course of that time” to fund the above projects. Unclear if that will be accompanied by federal funding, but I can't imagine how it wouldn't.
• He also said that United plans 25% growth at IAD over the next five years, with more than 1,000 new jobs coming there as well.