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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.
Too bad if you're already booked and the airline company changes the plane on you...
No. The "Contract of Carriage" that airlines create between you and them when you buy a ticket explicitly disclaims any liability for stuff like that. Delta's for domestic flights has, under "Rule 2", the following:
Every airline has basically the same contract. They can do whatever the fuck they want as long as they get you from A to B. They don't even have to use a plane, or get you there on time.
If people start choosing their flights based on aircraft type, it seems like the airline could just list all flights as the "good" aircraft and then automatically change it to the "bad" aircraft close to the departure date.