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Online travel agent allows customers to filter out Boeing 737 Max planes
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Presumably it only shows models that actually fly the route you're trying to book.
There aren't many Max 9's in the world, it's a brand new model. Also in some countries the model is not allowed to fly with passengers on board right now.
Yes I thought the same so searched for the flight I have booked that uses a Max 9 (UA DEN-FLL nonstop) and it doesn’t show as an option.
It shows up for me on the website with that origin and destination: