Originally Posted by
ashill
The scope clause limits regional aircraft to 76 seats, except I think US allowed some 80 seat RJs that carry over to AA. Definitely nothing larger than that on AA or any of the other three US airlines with regional affiliates, so the E190 and A220 are without question mainline aircraft no matter how they’re configured unless some airline decides to burn hundred dollar bills as fuel and use an all-J configuration or something.
I believe there is also an aircraft weight component to it as well, which is why the E75 E2 is not being ordered by the US3 as it is too heavy. If that plane is, I can't imagine a plane that is meant to seat another 30ish passengers is going to be light enough.