TTBW as Max replacement ? Well even though it can, it will be a decade more. Thus in mean times, if Boeing step away from E Series with Embrear and the problem MAX reputation and recertification, I don't know how Boeing will catch up quick on single aisle market. Or perhaps they are now already prepared to give the market to Airbus and content as number two. Seems the indication with Embrear deal falling through, they did. At least until Max replacement come out.