Origin of the stereotype of the blonde tour guide?

Where did the stereotype of the blonde tour guide saying “Buh-bye. Buh-bye now Buh-bye” come from? (It was the Barbie in Toy Story 2, for example.)

For one thing, I think the line is associated more with an airline stewardess than a tour guide.

David Spade did the buh-bye routine on an airline on a continuing basis on SNL, and this would be before Toy Story 2.

I associate it with being David and Helen Hunt, originally… (she was guest hosting.) Was this really the first time on SNL?