Magsau:
Thanks for the reply and your insight. But if you will indulge me, your comments lead to 2 more questions:
1.) Are the ACA operational problems at IAD generally limited to the J41 or do they affect the CRJ flights also?
2.) Do these problems also exist with ACA's operations at ORD where the carrier flies only CRJs?
Hopefully, ACA's operations at IAD will improve over the next 18 months as the remaining J41s are replaced by additional CRJs, although that alone won't necessarily address personnel and procedures issues.
And I agree with you that if a United shuttle operation starts at IAD, some current ACA and Air Wisconsin routes should revert to UA mainline (like LGA and ATL, respectively), assuming traffic and yields can again support it. And BOS, still a mainline route, would probably be another good shuttle candidate route.