One wonders, even if passed by the US legislation, what view EASA (and elsewhere) would have and whether they will tag along and certify it as well. Professionally, how can they ? And then, if it can't be used in Europe, the insurers (particularly the worldwide ones based in Europe) will start to have cold feet about it (particularly having been burned by two Max claims), and then the lessors and financiers will start feeling if it can only be leased in part of the world, what second user value is it going to have ? I know we have had aircraft only partially certified in the past, like the Trident, which was never even offered to the FAA, but that was from times when aircraft were just bought outright and had limited markets.