On 06 Apr 98, concerning _Triangulars_, Michael Holt said to Troy H. Cheek in 
UFO:
 MH> Delta wings and swept wings have been around since airplanes became
 MH> practical (or, "when engines became lighter").  Of course, before
 MH> that happened, we had birds.  But delta-winged machines made by man
 MH> start in about 1920.
And became faster and more agile than standard-design airplanes about when?
... "We're Young, Dumb and Ugly!" -Weird Al Yankovic
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