https://mynorthwest.com/3956084/boeing-slogan-if-its-not-history-its-a-mystery/
In that August 3, 1979 Seattle Post-Intelligencer piece, Watson asks, “Have you seen the latest local bumper sticker? ‘If it’s not Boeing, I’m not going.'”
and now, in the wake of the door plug incident with Alaska Airlines, that old slogan has been showing up on social media as “if it IS Boeing, I’m not going.”