Aer Lingus at IAD ( Wash DC)

I cannot answer your question, but IAD still uses some mobile boarding lounges. They seem to slow down the unloading process, because they do not move until they are packed full. You may have a prime seat in front of the plane, but that won't get you to the gate particularly fast. (It will, however, get you a seat on the mobile lounge.)

This is from ThePointsGuy: "Mobile lounges, as dated as they are, continue to be in use at Dulles. While they rarely carry travelers directly to or from their planes these days, they do connect Concourse D to the main terminal, as well as ferry passengers arriving from international flights to the customs hall."

I don't know whether it's true that you are unlikely to encounter a mobile lounge on your eastbound journey, but it appears it could be a significant issue westbound.

IAD is my home (international) airport, but I've never changed planes there, so I have no idea what I'd be comfortable with in terms of transfer time.

If you are arriving from an international flight and heading west, you need way more time than 75 mins.

Even if you arrive from an international flight at a B gate and your domestic flight back to Seattle departs from a B gate, you will still need to board a mobile shuttle to the customs and immigration hall which is a completely different concourse. Then when you get thru that, you ride back to the B concourse to depart for Seattle. This all takes a lot more time than 75 mins.

For clarification I am headed TO Europe

SEA-IAD-DUB-AMS Single ticket

Aer Lingus uses the B gates. Take a look at this map.

https://www.united.com/ual/en/us/fly/travel/airport/maps/iad.html

This is what you need to check out for Dulles. Every major airport has one.

https://flydulles.com/iad/dulles-international-airport

Sorry that my response confused others. I knew the 75-min. transfer time was eastbound, but I thought you might also be planning to return through Dulles.

Thank you Laura.
It would have been a LONG time before I would have looked at the UAL site for which gates Aer Lingus uses at IAD ( or any airport)

Too soon to determine which gates Are Lingus will use in 2021 as they haven't re-started service yet to IAD. Dulles will probably revamp all of the Int'l gates when most of the airlines start up again.
Your itinerary indicates AMS is your final destination. Are you stoping over in Ireland and then on to AMS? Or are you connecting in DUB to AMS? If the latter you'd be better off taking the SEA-AMS non-stop. Would make for a much easier flight to Europe.

To A-A---
As I am using FF miles to get biz class, this is, so far, the best solution.
BA has a one stop from SEA, but has $400+ in fees per person.
The Aer Lingus routing has $30 fee per person.

hey joe32F
are you moving? saw you post for a single ticket to AMS, just curious and a little "nosy"!
by the way, loved amsterdam so much we went twice. don't mixed up your white choco strain
with white chocolate latte at the coffeeshops. enjoy
aloha

Princess P

My reference to 'single ticket', was to indicate the journey is on a single booking, not a cobbled together 'hope I make it' series of bookings.

Not moving, just hoping I will get to do the Best of Europe tour. Got squashed one year by knee surgery, last year by family issues and this year by covid. Since I am leading such a charmed life, would you like me to recommend some investments? :-)

Too soon to determine which gates Are Lingus will use in 2021

For years, United has used the C/D gates and the majority of the other airlines have used the B gates. Unless United goes out of business, I doubt you will see your flights out of C or D.

"just hoping I will get to do the Best of Europe tour."

I know you are an experienced traveler but I will add I hope you will give yourselves an extra night or two before the start of this awesome tour. It is busy but tiring and you do not want to start it not at full speed from jet lag/travel tiredness.

Have a wonderful time and fingers crossed it works for you! This remains one of my favorite tours and tour groups - still in touch with about a dozen fellow travelers from 2014. You really bond after 3 weeks.

hey hey joe
had a 99% feeling that's what it was. your charmed life have a "go fund me" hoping for a wing and a prayer back to seattle. :)
are you staying in amsterdam central, picked hotel and how many days before tour? i'll make a few suggestions you may or may not be interested in, but at least some options. i'm sure some of your tour will be doing things within center and maybe a ride out to haarlem. will send you a message when i got it together.
totally understand the covid dilemma, my family trip back to big island is on hold. was flying southwest oakland to kona, cancelled and put my $$$ in a travel fund account, no cash refund for me. since i'm retired i can go anytime and always have a place to stay with my sister. the virus count is going up everyday with flight arrivals and 14 day quarantine, which is beyond me, why go then defy the state laws and rules because "you're special and priviledged"

aloha