The Flash Vol.2 #162
Linda Park-West and the Flash are visiting the Central Expo Center's Broadcaster's Convention. Linda is not amused when her new boss introduces her as Mrs. Flash to draw some extra attention.
On the next day, Wally and Linda accompany young Billy Batson, who visited the convention as well, to the airport. When Linda and Billy talk to a flight attendee, they are suddenly spouting seemingly nonsensical incantations which seem to turn the world around them into a medieval state. That only lasts for a few seconds, but as a side effect a plane is about to crash into the airport which forces both the Flash and Captain Marvel to interfere.
Estimated Condition: VF/NM