My time: 6:59, nearly three minutes faster than average.
Theme: Three pairs of words that are "flipped" version of each other. For example, MALE HEIR and AIRMAIL.
This took longer than it might have as PLAIN-TOE, as in a type of shoe, the flip of TOWPLANE, and THYME TEA, the slip of TEE TIME, are not in my wheelhouse. I won't say those those pairs are a bit labored, because the terms exist, but I would have tried to go with more common "flipped" pairs.
Never heard of the company Bethlehem STEEL. The company's roots trace to 1857 with the establishment of the Bethlehem Iron Company in Bethlehem, Pennsylvania. Bethlehem Steel was formed in 1904, and existed through the decline of American steel manufacturing during the 1970s until its bankruptcy in 2001 and final dissolution in 2003.
Eldest von Trapp daughter in "The Sound of Music" is LEISL von Trapp. She is 16 going on 17, and in love with Rolf, the telegram delivery boy. She was played by the actress Charmian Carr here. In real life, the eldest of the real Von Trapp children was Rupert Von Trapp and Agathe Von Trapp was the eldest girl. The female character of Liesl was created for the movie.
University of New Mexico mascot LOBO last appeared on September 23, when I wrote "maybe one day I'll remember." Not today!
John Jordan Buck O'NEIL, first African-American coach in the MLB, came up on October 20, 2017.
Cable news anchor ARI Melber was in the blog on August 27.
Clever clue: "Signed, sealed, or delivered" is PAST TENSE.
This was a pretty average Wednesday puzzle. The theme was a little cutesy, and as I said, relied on some rather abstruse words. On the other hand, kudos for putting in nice fill like VORTEX, VARIETY ACT, and ARID ZONE.