What's The Worst Commercial Passenger Plane Still In Use?S

I've been flying a little more lately and it's become obvious how much of a range there is in the quality of the planes that are flying around, even within a single airline. But what's the worst commercial passenger plane still in regular use?

I'm going to start easy and domestic with the MD-80. It's an improved DC-9, which was a great planeā€¦ for 1965. The design is far too old and I actively seek out other planes when given the choice. American Airlines and Delta both have more than 100 of these in their fleets and they're cramped, dingy, inefficient, and slow. You're much better off in a 737 or A320.

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