The oldest operating airline in the world is the national Dutch airline known by which three letters?

A1 - TWA
B2 - KLM
C3 - ETA

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Answer: KLM Royal Dutch Airlines is the national carrier of the Netherlands. Founded in 1919, KLM holds the distinction of being the oldest operating airline in the world. The first flights began in May 1920, between London and Amsterdam. KLM has grown dramatically in its 100-plus years of service, now operating a fleet of over 100 aircraft. Today, the airline is part of the Air France-KLM group. The two airlines merged in 2005, but operations and branding remain separate. As such, KLM is able to stake a claim to continuous operation under the same name.

Also -

What shape is a Major League Baseball pitcher's plate?

1 - Triangle, 2 - Rectangle, 3 - Pentagon, 4 - Trapezoid

The pitching rubber or pitcher's plate is a flat rectangular slab made of whitened hard rubber on top of the pitcher's mound, which the pitcher must touch while beginning his motion to throw. Most pitchers work from the center of the rubber, using it to push off with their back foot to obtain additional velocity on their pitches. The rubber's dimension is 24 inches by 6 inches, according to section 1.07 of the rules. It is set so that its front edge is 60 feet 6 inches from the rear point of home plate and is elevated 10 inches above the rest of the playing field.