FYI - Although Airspace is not a PP lounge, the Chesapeake Club Lounge is part of the PP network.

Difficult conditions to deal with below given that there are basically no international flights out of BWI these days; even Icelandair is gone.:
From Priority Pass" Conditions: International flights from Pier E only - Children under 2 years are admitted free - Alcoholic drinks are only available to passengers 21 years of age or older - Non-smoking."

Tough to find an electric outlet at Chesapeake too and it's windowless.

I flew business a few months ago on BA out of BWI (first time doing so btw) and got there early and me and other unhappy customers went over to D and I let my fellow BA flyers into Airspace as guests of mine under Amex. ^

Access to club lounge
 

Will security let you go to D gates even if your flight is leaving from B gates.

Yes, I did this two weeks ago to check out the new "The Club" lounge. Be aware though, it's a pretty long walk in D to get there. Unless you have at least an hour to kill it's probably not worth it.

Second that, even if you have an hr+ it's a very basic lounge. Definitely not worth spending time and effort making it there. Nice to have if you're leaving out of D or E though.