IIRC, Comcast uses "local-as 7922" path rewriting for all enterprise EDI customers
running BGP off of regional CRANs, unless I'm mistaken.  So if your regional CRAN
is as7015 (for New England), even if your physical circuit and BGP session land
on a local SUR in your area, you have to use remote-as 7922 to setup the session
with Comcast ENS, regardless of the fact that actual peer's router is using as7015.