If oneworld could work out a decent mileage earning rate with B6 I'd LOVE this. I think it could work well. One of the main sticking points is B6's lack of a F cabin. But for intl/connecting pax, B6 could add a "transfer lounge" at JFK and BOS for pax connecting from J/F on AA/BA/IB/RJ to Y on B6. It could be like a mini Galleries lounge with free drinks etc. Give those same biz/first pax guaranteed Even More Legroom seats on B6 and the difference between flying a domestic segment on B6 vs AA say between JFK-PIT or JFK-RDU is negligible. Actually I think most premium pax would have a BETTER experience flying B6 on E190 than AE on a crAApy ERJ. Plus it would open destinations like PWM, BTV and ACK.